boot/xilinx-embeddedsw: add comment dependencies

Since the comment about the xilinx-embeddedsw package needing a bare-metal
toolchain was moved to the start of the Config.in file, it is now printing
in make menuconfig for virtually all defconfigs.

By adding the same dependencies as the xilinx-embeddedsw package, the
comment will appear only when the xilinx-embeddedsw package is actually
selectable.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

boot/xilinx-embeddedsw/Config.in

@@ -1,5 +1,7 @@
 comment "xilinx-embeddedsw needs a bare metal toolchain for tuple microblazeel-buildroot-elf"
 	depends on BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH != "microblazeel-buildroot-elf"
+	depends on BR2_aarch64
+	depends on BR2_TOOLCHAIN_BARE_METAL_BUILDROOT
 
 menuconfig BR2_TARGET_XILINX_EMBEDDEDSW
 	bool "xilinx-embeddedsw"