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

[Yu-Ping Wu (Code Review)]

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

Yu-Ping Wu 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:

(2 comments)

File src/soc/mediatek/common/include/soc/gpio_common.h:

https://review.coreboot.org/c/coreboot/+/83703/comment/668ebf2b_bd598adf?usp... :
PS2, Line 123: void
struct eint_regs

https://review.coreboot.org/c/coreboot/+/83703/comment/e1e03199_eb43da79?usp... :
PS2, Line 122: void pos_bit_calc_for_eint(gpio_t gpio, u32 *pos, u32 *bit);
             : void *eint_find_reg_addr(gpio_t gpio);
Since these functions are still declared here in gpio_common.h and are related to gpio, how about:

1. Rename eint_v1.c to gpio_eint_v1.c
2. Use `gpio_` prefix for these 2 functions (for example `gpio_get_eint_reg` and `gpio_calc_eint_pos_bit`)