[XS] Change in coreboot[master]: drivers/aspeed/common/ast_drv.h: Use C99 flexible arrays

[Maximilian Brune (Code Review)]

Attention is currently required from: Elyes Haouas, Martin L Roth.

Maximilian Brune has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/76844?usp=email )

Change subject: drivers/aspeed/common/ast_drv.h: Use C99 flexible arrays
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Patch Set 2:

(1 comment)

File src/drivers/aspeed/common/ast_drv.h:

https://review.coreboot.org/c/coreboot/+/76844/comment/ef8b12ba_025efdc7 :
PS2, Line 251: struct drm_format {
             : 	u32 cpp[]; /* Colors per pixel */
             : };
             :
> Unfortunately, this gives an error. […]

Can't we just replace
```
u32 cpp[1];
```
with
```
u32 cpp;
```
?
Looking at the references of the "cpp" property in the coreboot tree it seems like only the first element is always referenced and its not actually used in a flexible array manner.