[S] Change in coreboot[main]: soc/mediatek/mt8196: Add NOR-Flash support

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Hung-Te Lin, Jarried Lin, Paul Menzel.

Yu-Ping Wu has posted comments on this change by Jarried Lin. ( https://review.coreboot.org/c/coreboot/+/83923?usp=email )

Change subject: soc/mediatek/mt8196: Add NOR-Flash support
......................................................................

Patch Set 7: -Code-Review

(1 comment)

File src/soc/mediatek/mt8196/spi.c:

https://review.coreboot.org/c/coreboot/+/83923/comment/141d67b3_30772206?usp... :
PS5, Line 33: void mtk_snfc_init(void)
            : {
            : 	const struct pad_func *ptr;
            : 
            : 	for (size_t i = 0; i < ARRAY_SIZE(nor_pinmux); i++) {
            : 		ptr = &nor_pinmux[i];
            : 
            : 		gpio_set_pull(ptr->gpio, GPIO_PULL_ENABLE, ptr->select);
            : 		gpio_set_mode(ptr->gpio, ptr->func);
            : 
            : 		if (gpio_set_driving(ptr->gpio, GPIO_DRV_14_MA) < 0)
            : 			printk(BIOS_ERR,
            : 			       "%s: failed to set pin drive to 14 mA for %d\n",
            : 				__func__, ptr->gpio.id);
            : 		else
            : 			printk(BIOS_DEBUG, "%s: got pin drive: %#x\n", __func__,
            : 			       gpio_get_driving(ptr->gpio));
            : 	}
            : }
> It would be nice to make them as similar as possible. […]

I agree that part of the code (and the `pad_func` struct) can be moved to the common code (but of course after `gpio_t` is moved to common code, as suggested in CB:83922), so that it could be shared among mt8186, mt8188 and mt8196. How about we add

```
// Whatever name you prefer
void mtk_snfc_init_pad_func(const struct pad_func *pad_func);
```

to the common code, and then here the code can be simplified:

```
void mtk_snfc_init(void)
{
    for (...)
        mtk_snfc_init_pad_func(&nor_pinmux[i]);
}
```