configs/spike_riscv64: bump kernel to 6.6.35 and add hashes

Commit [1] introduced a new spike_riscv32_defconfig with Kernel
at v6.6.35.

This commit bumps the Kernel of spike_riscv64_defconfig to have it
aligned with its 32bit counterpart.

This commit also adds custom hashes. Therefore, it adds
BR2_DOWNLOAD_FORCE_CHECK_HASHES=y in the defconfig, adds a global
patch directory, and removes the entry in ".checkpackageignore".

Finally, to completely align with the spike_riscv32_defconfig, the
config directive BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM is moved by few
lines.

With this commit, the maintenance of the two spike_riscv{32,64}
defconfigs will be easier.

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/a83ab3f4c8621dec58dc78a8dcb48e519377ac3d

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

.checkpackageignore

@@ -281,7 +281,6 @@ configs/socrates_cyclone5_defconfig lib_defconfig.ForceCheckHash
 configs/solidrun_clearfog_defconfig lib_defconfig.ForceCheckHash
 configs/solidrun_clearfog_gt_8k_defconfig lib_defconfig.ForceCheckHash
 configs/solidrun_macchiatobin_defconfig lib_defconfig.ForceCheckHash
-configs/spike_riscv64_defconfig lib_defconfig.ForceCheckHash
 configs/stm32mp157c_dk2_defconfig lib_defconfig.ForceCheckHash
 configs/stm32mp157c_odyssey_defconfig lib_defconfig.ForceCheckHash
 configs/terasic_de10nano_cyclone5_defconfig lib_defconfig.ForceCheckHash

board/spike/riscv64/patches/linux-headers/linux-headers.hash

@@ -0,0 +1 @@
+../linux/linux.hash

board/spike/riscv64/patches/linux/linux.hash

@@ -0,0 +1,2 @@
+# From https://cdn.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
+sha256  fce3ee728712ed063aa8c14a8756c8ff8c7a46ba3827f61d2b04a73c7cf5dd9e  linux-6.6.35.tar.xz

board/spike/riscv64/patches/opensbi/opensbi.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  319b62a4186fbce9b81a0c5f0ec9f003a10c808397a72138bc9745d9b87b1eb1  opensbi-1.4.tar.gz

configs/spike_riscv64_defconfig

@@ -1,10 +1,12 @@
 BR2_riscv=y
 BR2_RISCV_64=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
+BR2_GLOBAL_PATCH_DIR="board/spike/riscv64/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.26"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.35"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
 BR2_TARGET_ROOTFS_CPIO=y
 # BR2_TARGET_ROOTFS_TAR is not set
 BR2_TARGET_OPENSBI=y