soc/amd/non-car: Don't add bootblock cbfs file

The bootblock.elf file gets embedded in the BIOSPSP part and loaded by
the PSP in dram. The top aligned bootblock in cbfs is unused.

Tested on Cezanne/Guybrush.

Change-Id: I72f0092e0e3628b388f6da6a417c2857a510b187
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63226
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/amd/common/block/cpu/Kconfig

@@ -20,6 +20,10 @@ config SOC_AMD_COMMON_BLOCK_NONCAR
 
 if SOC_AMD_COMMON_BLOCK_NONCAR
 
+config BOOTBLOCK_IN_CBFS
+	bool
+	default n
+
 config MEMLAYOUT_LD_FILE
 	string
 	default "src/soc/amd/common/block/cpu/noncar/memlayout.ld"