[M] Change in coreboot[main]: mb/google/fatcat: Add ISH support with FW_CONFIG toggle

[Li1 Feng (Code Review)]

Attention is currently required from: Bora Guvendik, Pranava Y N, Subrata Banik.

Li1 Feng has posted comments on this change by Subrata Banik. ( https://review.coreboot.org/c/coreboot/+/84998?usp=email )

Change subject: mb/google/fatcat: Add ISH support with FW_CONFIG toggle
......................................................................

Patch Set 2:

(1 comment)

File src/mainboard/google/fatcat/variants/fatcat/fw_config.c:

https://review.coreboot.org/c/coreboot/+/84998/comment/0db8e7a3_0c18e80c?usp... :
PS2, Line 469: static const struct pad_config ish_enable_pads[] = {
In the enable, D5&6 are for UART0
    /* GPP_D05:     ISH_UART0_RXD */
    PAD_CFG_NF(GPP_D05, NONE, DEEP, NF2),
    /* GPP_D06:     ISH_UART0_TXD */
    PAD_CFG_NF(GPP_D06, NONE, DEEP, NF2),
    
currently we don't use I3C, H14&15 can be moved out and set to NC.

D07&08 also can be NC all the time. 
    /* GPP_D07:     Not used */
    PAD_NC(GPP_D07, NONE),
    /* GPP_D08:     Not used */
    PAD_NC(GPP_D08, NONE),