Change in coreboot[master]: vendor: mediatek: Add mediatek mt8192 dram initialization codes

[Hung-Te Lin (Code Review)]

Attention is currently required from: Xi Chen, Nico Huber, Martin Roth, Paul Menzel, Yu-Ping Wu.
Hung-Te Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50294 )

Change subject: vendor: mediatek: Add mediatek mt8192 dram initialization codes
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Patch Set 9:

(5 comments)

File src/vendorcode/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/50294/comment/b2769ec1_839e1d3b 
PS8, Line 7: #
remove this comment?

File src/vendorcode/mediatek/Kconfig:

https://review.coreboot.org/c/coreboot/+/50294/comment/f74dae0f_95c8e200 
PS9, Line 9: config MT8192_DRAM_EMCP
           : 	bool
           : 	default y
           : 	help
           : 	  The eMCP platform should select this option to run at different DRAM
           : 	  frequencies.
Is this still used? I thought we are using sdram_params for EMCP now.

File src/vendorcode/mediatek/mt8192/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/50294/comment/59f4dca7_cd5c2cab 
PS9, Line 7: ramstage-y += dpm.c
why is dpm included?

https://review.coreboot.org/c/coreboot/+/50294/comment/57a8d5df_8f6e4783 
PS9, Line 9: BL31_MAKEARGS += PLAT=mt8192
we don't need this?

File src/vendorcode/mediatek/mt8192/dpm.c:

https://review.coreboot.org/c/coreboot/+/50294/comment/86486115_980f5621 
PS9, Line 1: License
dpm should not be in DRAM code?