[coreboot-gerrit] [S] Change in coreboot[master]: mb/google/corsola: Add detachable Starmie as variant

[Yidi Lin (Code Review)]

Attention is currently required from: Ruihai Zhou.

Yidi Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74048 )

Change subject: mb/google/corsola: Add detachable Starmie as variant
......................................................................

Patch Set 9:

(2 comments)

File src/mainboard/google/corsola/display.c:

https://review.coreboot.org/c/coreboot/+/74048/comment/11a3fe33_747ccb35 
PS9, Line 135: const struct edp_bridge *bridge;
`const struct edp_bridge *bridge = NULL;`

https://review.coreboot.org/c/coreboot/+/74048/comment/9f5a8e5e_42a31895 
PS9, Line 153: assert(bridge->power_on);
Just return -1 and move to line 145.
```
if (!bridge || !bridge->power_on)
  return -1;
```

In MIPI panel case, it is possible that we develop on a bare board without the MIPI panel then we will get a NULL handler(CB:74051). We should not assert here and block the booting if the MIPI panel does not exist.