Change in coreboot[master]: drivers/generic/bayhub_lv2: Add driver for BayHub lv2

[Martin Roth (Code Review)]

Attention is currently required from: Frank Wu, John Su, Furquan Shaikh, Alan Lee, Angel Pons, Ivy Jian, EricR Lai.
Martin Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49783 )

Change subject: drivers/generic/bayhub_lv2: Add driver for BayHub lv2
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Patch Set 7:

(3 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/49783/comment/75b2a84b_6916fa94 
PS7, Line 13: 
We lost the TEST= message in patch set 3.

Hazards of using the gerrit editor.  :)

File src/drivers/generic/bayhub_lv2/lv2.c:

https://review.coreboot.org/c/coreboot/+/49783/comment/dbf56d4b_aac65768 
PS7, Line 19: 	if (config && config->power_saving) {
Maybe:

if (!config || !config->power_saving)
    return;

Then you don't need to indent all of the below lines.

https://review.coreboot.org/c/coreboot/+/49783/comment/c2a3ef08_fc56ce3b 
PS7, Line 26: 0x0FFFFFFF
I'm not positive, but I think Furquan might have wanted macros for the mask values as well.   I'll let him answer if he didn't but since that was specifically the value he highlighted, I'd think it's a safe assumption.

#define LV2_PCI_TIMER_MASK or some such.