[M] Change in coreboot[master]: Add first BIOS block in coreboot.pre

[Arthur Heymans (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Martin L Roth, Matt DeVillier, Julius Werner, Fred Reitberger, Karthik Ramasubramanian, Felix Held.

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/66943 )

Change subject: Add first BIOS block in coreboot.pre
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Patch Set 7:

(1 comment)

File Makefile.inc:

https://review.coreboot.org/c/coreboot/+/66943/comment/c30ef9a4_17346c98 
PS7, Line 1112: FIRST_BIOS_BLOCK=$(objcbfs)/bootblock.bin
              : ifeq ($(CONFIG_AMDFW_CONTAINS_FIRST_BIOS_BLOCK),y)
              : FIRST_BIOS_BLOCK=$(obj)/amdfw.rom
              : add_firstbiosblock = \
              : 	$(CBFSTOOL) $(1) add -f $(2) -n apu/amdfw -t amdfw \
              : 	-b $(call int-add, \
              : 	$(call int-subtract, 0xffffffff \
              : 	$(call int-shift-left, \
              : 	0x80000 $(CONFIG_AMD_FWM_POSITION_INDEX))) 0x20000 1)
              : endif # ifeq ($(CONFIG_AMDFW_CONTAINS_FIRST_BIOS_BLOCK),y)
Add this somewhere in soc/amd ?