[M] Change in coreboot[main]: soc/amd: rework SPL file override and SPL fusing handling

[9elements QA (Code Review)]

9elements QA has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78178?usp=email )

Change subject: soc/amd: rework SPL file override and SPL fusing handling
......................................................................

Patch Set 3:

Automatic boot test returned (PASS/FAIL/TOTAL): 11 / 1 / 12

PASS: x86_32  "Hermes CFL" , build config PRODRIVE_HERMES_ 
     and payload TianoCore_UefiPayloadPkg : https://lava.9esec.io/r/187060
PASS: x86_32  "Hermes CFL" , build config PRODRIVE_HERMES 
     and payload TianoCore_UefiPayloadPkg : https://lava.9esec.io/r/187058
PASS: x86_32  "ThinkPad T500" , build config LENOVO_T500 
     and payload SeaBIOS : https://lava.9esec.io/r/187057
PASS: x86_32  "HP Z220 SFF Workstation" , build config HP_Z220_SFF_WORKSTATION 
     and payload LinuxBoot_BB_kexec : https://lava.9esec.io/r/187056
PASS: x86_64  "HP Compaq 8200 Elite SFF PC" , build config HP_COMPAQ_8200_ELITE_SFF_PC.X86_64 
     and payload TianoCore : https://lava.9esec.io/r/187055
PASS: x86_64  "HP Compaq 8200 Elite SFF PC" , build config HP_COMPAQ_8200_ELITE_SFF_PC.X86_64 
     and payload SeaBIOS : https://lava.9esec.io/r/187054
PASS: x86_32  "HP Compaq 8200 Elite SFF PC" , build config HP_COMPAQ_8200_ELITE_SFF_PC 
     and payload TianoCore : https://lava.9esec.io/r/187053
PASS: x86_32  "HP Compaq 8200 Elite SFF PC" , build config HP_COMPAQ_8200_ELITE_SFF_PC 
     and payload SeaBIOS : https://lava.9esec.io/r/187052
PASS: x86_64  "QEMU x86 i440fx/piix4" , build config EMULATION_QEMU_X86_I440FX_X86_64 
     and payload SeaBIOS : https://lava.9esec.io/r/187051
PASS: x86_32  "QEMU x86 i440fx/piix4" , build config EMULATION_QEMU_X86_I440FX_ASAN 
     and payload SeaBIOS : https://lava.9esec.io/r/187050
PASS: x86_32  "QEMU x86 i440fx/piix4" , build config EMULATION_QEMU_X86_I440FX_ 
     and payload SeaBIOS : https://lava.9esec.io/r/187049
FAIL: x86_32  "QEMU x86 i440fx/piix4" , build config EMULATION_QEMU_X86_I440FX 
     and payload SeaBIOS : https://lava.9esec.io/r/187048

Please note: This test is under development and might not be accurate at all!