[S] Change in coreboot[main]: soc/mediatek: Move SNFC pad_func into MediaTek common directory

[Yu-Ping Wu (Code Review)]

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

Yu-Ping Wu has posted comments on this change by Jarried Lin. ( https://review.coreboot.org/c/coreboot/+/83989?usp=email )

Change subject: soc/mediatek: Move SNFC pad_func into MediaTek common directory
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Patch Set 6:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/83989/comment/3516134d_ed68ec25?usp... :
PS6, Line 9: To reduce duplicate pad_func of MediaTek SoCs,
           : Move the pad_fun to a common directory
Single paragraph with max 72 chars per line.

```
To reduce duplicate pad_func of MediaTek SoCs, move the pad_fun to a common directory.
```

File src/soc/mediatek/common/flash_controller.c:

https://review.coreboot.org/c/coreboot/+/83989/comment/df0c3248_dcb4ad4f?usp... :
PS6, Line 229: 
Remove blank line.