board/qemu/riscv{32, 64}-virt: remove virtio-blk-device, drive=hd0

Qemu 9.1 recently fixed the RISC-V virt target by adding the missing
default type for block devices [1].

We no longer need to specify virtio-blk-device on the qemu command line
since it's already the default.

[1] https://gitlab.com/qemu-project/qemu/-/commit/4406ba2b5efce6af64905f827ca244f699db8170

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Cc: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/qemu/riscv32-virt/readme.txt

@@ -1,7 +1,7 @@
 Run Linux in emulation with:
 
-  qemu-system-riscv32 -M virt -bios output/images/fw_jump.elf -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0,if=none -device virtio-blk-device,drive=hd0 -netdev user,id=net0 -device virtio-net-device,netdev=net0 -nographic # qemu_riscv32_virt_defconfig
+  qemu-system-riscv32 -M virt -bios output/images/fw_jump.elf -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw -netdev user,id=net0 -device virtio-net-device,netdev=net0 -nographic # qemu_riscv32_virt_defconfig
 
-  qemu-system-riscv32 -M virt -bios none -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0,if=none -device virtio-blk-device,drive=hd0 -nographic -cpu rv32,mmu=off -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 # qemu_riscv32_nommu_virt_defconfig
+  qemu-system-riscv32 -M virt -bios none -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw -nographic -cpu rv32,mmu=off -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 # qemu_riscv32_nommu_virt_defconfig
 
 The login prompt will appear in the terminal that started Qemu.

board/qemu/riscv64-virt-efi/readme.txt

@@ -22,8 +22,7 @@ Run the emulation with:
         -blockdev node-name=pflash0,driver=file,read-only=on,filename=output/images/RISCV_VIRT_CODE.fd \
         -blockdev node-name=pflash1,driver=file,filename=output/images/RISCV_VIRT_VARS.fd \
         \
-        -drive file=output/images/disk.img,format=raw,id=hd0,if=none \
-        -device virtio-blk-device,drive=hd0 \
+        -drive file=output/images/disk.img,format=raw \
         \
         -netdev user,id=net0 \
         -device virtio-net-device,netdev=net0 # qemu_riscv64_virt_efi_defconfig

board/qemu/riscv64-virt/readme.txt

@@ -1,7 +1,7 @@
 Run Linux in emulation with:
 
-  qemu-system-riscv64 -M virt -bios output/images/fw_jump.elf -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0,if=none -device virtio-blk-device,drive=hd0 -netdev user,id=net0 -device virtio-net-device,netdev=net0 -nographic # qemu_riscv64_virt_defconfig
+  qemu-system-riscv64 -M virt -bios output/images/fw_jump.elf -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw -netdev user,id=net0 -device virtio-net-device,netdev=net0 -nographic # qemu_riscv64_virt_defconfig
 
-  qemu-system-riscv64 -M virt -bios none -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0,if=none -device virtio-blk-device,drive=hd0 -nographic -cpu rv64,mmu=off -netdev user,id=net0 -device virtio-net-device,netdev=net0 # qemu_riscv64_nommu_virt_defconfig
+  qemu-system-riscv64 -M virt -bios none -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw -nographic -cpu rv64,mmu=off -netdev user,id=net0 -device virtio-net-device,netdev=net0 # qemu_riscv64_nommu_virt_defconfig
 
 The login prompt will appear in the terminal that started Qemu.