[S] Change in coreboot[master]: nb/intel/snb/raminit_mrc.c: Provide default for hook

[Matt DeVillier (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Keith Hui.

Matt DeVillier has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/72496 )

Change subject: nb/intel/snb/raminit_mrc.c: Provide default for hook
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Patch Set 7:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/72496/comment/25c28506_51e62a80 
PS7, Line 9: Of the 13 mainboards that implement mainboard_should_reset_usb() hook,
           : only samsung/stumpy does things differently. Turn the majority
           : implementation into a __weak default that this one board will override.
> Matt, do you have a stumpy?

I do. looking at Stumpy's implementation and the comments, we may be able to drop it since the WA was likely for a 2.x ChromeOS kernel. Want me to test with using the common implementation?