[XS] Change in coreboot[main]: mt8188: Let BL32 image loading from rootfs

[Yidi Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Kiwi Liu, Yu-Ping Wu.

Yidi Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78801?usp=email )

Change subject: mt8188: Let BL32 image loading from rootfs
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Patch Set 9:

(3 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/78801/comment/508681bf_6ce99a68 :
PS9, Line 7: mt8188: Let BL32 image loading from rootfs
soc/mediatek/mt8188: Support loading BL32 image from rootfs

https://review.coreboot.org/c/coreboot/+/78801/comment/934599a9_67c19ec4 :
PS9, Line 9: For HW DRM on ARM we want to load the BL32 image from the rootfs rather than including it in the firmware.
           : This commit is for loading of BL32 image from rootfs.
This patch adds compilation flags to BL31 to support loading BL32 image from rootfs. This patch also reserves 80MB memory space for running BL32 image.

File src/soc/mediatek/mt8188/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/78801/comment/4b8b5e2e_698e65fd :
PS9, Line 61: SPD=opteed OPTEE_ALLOW_SMC_LOAD=1 PLAT_XLAT_TABLES_DYNAMIC=1 CROS_WIDEVINE_SMC=1
BL31_MAKEARGS += SPD=opteed OPTEE_ALLOW_SMC_LOAD=1 PLAT_XLAT_TABLES_DYNAMIC=1 CROS_WIDEVINE_SMC=1