[M] Change in coreboot[main]: mb/amd/common: Add common directory

[Paul Menzel (Code Review)]

Attention is currently required from: Ana Carolina Cabral.

Paul Menzel has posted comments on this change by Ana Carolina Cabral. ( https://review.coreboot.org/c/coreboot/+/84776?usp=email )

Change subject: mb/amd/common: Add common directory
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Patch Set 3:

(3 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/84776/comment/d21564e4_91878994?usp... :
PS3, Line 7: Add common directory
           : 
Maybe:
> Add common NOVA daughter board detection

File src/mainboard/amd/common/nova/Makefile.mk:

https://review.coreboot.org/c/coreboot/+/84776/comment/d0d470b9_2fef8118?usp... :
PS3, Line 6:
> Just one blank line please

I meant no blank lines at the end of files please.

File src/mainboard/amd/common/nova/nova_card.c:

https://review.coreboot.org/c/coreboot/+/84776/comment/1de51e53_374e719c?usp... :
PS3, Line 25:  	uint16_t connector_type = data[1] | data[0] << 8;
> `code indent should use tabs where possible`

Please fix.