[L] Change in coreboot[main]: mainboard: Add MSI MS-7788

[Alicja Michalska (Code Review)]

Attention is currently required from: Angel Pons, Felix Singer, Maximilian Brune, Name of user not set #1005283.

Alicja Michalska has posted comments on this change by Name of user not set #1005283. ( https://review.coreboot.org/c/coreboot/+/79979?usp=email )

Change subject: mainboard: Add MSI MS-7788
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Patch Set 9:

(7 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/79979/comment/6dc61c93_aa7ddad1?usp... :
PS9, Line 11:   * I disabled it and everything seems to work...
Add early init to your mainboard tree, disable it in bootblock by calling the function:

```
#include <bootblock_common.h>
#include <northbridge/intel/sandybridge/sandybridge.h>

void bootblock_mainboard_early_init(void)
{ mchbar_write16(SSKPD_HI, 0); }
```

https://review.coreboot.org/c/coreboot/+/79979/comment/9ecd826e_d3ed9683?usp... :
PS9, Line 44: * PS/2
Likely won't work without configuring SIO registers

https://review.coreboot.org/c/coreboot/+/79979/comment/ff450a84_2c4e1baa?usp... :
PS9, Line 47: Signed-off-by: mrhh69 
Incorrect sign-off

File src/mainboard/msi/ms7788/Kconfig:

https://review.coreboot.org/c/coreboot/+/79979/comment/6506076a_c335c1fa?usp... :
PS9, Line 1: if BOARD_MSI_MS_7788
Missing license identifier

File src/mainboard/msi/ms7788/Kconfig.name:

https://review.coreboot.org/c/coreboot/+/79979/comment/4273552d_d345191c?usp... :
PS9, Line 1: config BOARD_MSI_MS_7788
Missing license identifier

File src/mainboard/msi/ms7788/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/79979/comment/f0a02bea_e37d5e09?usp... :
PS9, Line 8: 			register "docking_supported" = "0"
Why? This board isn't a laptop, right?

File src/northbridge/intel/sandybridge/romstage.c:

https://review.coreboot.org/c/coreboot/+/79979/comment/652e8c1b_ad3f409d?usp... :
PS9, Line 56: 	//if (mchbar_read16(SSKPD_HI) == 0xcafe)
Please avoid modifying common code. If there are other mainboards experiencing the same issue, we could convert it to Kconfig option.