[M] Change in coreboot[main]: soc/mediatek/common: Refactor EINT driver

[Yidi Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Paul Menzel, Xi Chen, Yu-Ping Wu.

Yidi Lin has posted comments on this change by Yidi Lin. ( https://review.coreboot.org/c/coreboot/+/83703?usp=email )

Change subject: soc/mediatek/common: Refactor EINT driver
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Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/83703/comment/203db8dc_6ae4ab95?usp... :
PS2, Line 13: This change is prepared for the driver change in MT8196.
> As you named the new file `eint_v1`, is it planned to have v2 driver?

It is not necessary to have v2 driver. It simply means that the platforms which use `eint_v1.c` have the same ways for bit/pos calculation and obtaining the base register. MT8196 will have its own eint.c in its SoC folder.