[L] Change in coreboot[master]: ec/google/chromeec: Use host command API

[Caveh Jalali (Code Review)]

Attention is currently required from: Subrata Banik, Nick Vaccaro, Yu-Ping Wu, Boris Mittelberg.

Caveh Jalali has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/73325 )

Change subject: ec/google/chromeec: Use host command API
......................................................................

Patch Set 2:

(1 comment)

File src/ec/google/chromeec/ec.c:

https://review.coreboot.org/c/coreboot/+/73325/comment/81ce6f8f_25471347 
PS1, Line 523: 	struct chromeec_command cmd = {
> I see. […]

the variable size param/response cases i'm referring to aren't
implemented in ec_cmd_api.h, so this file isn't in an intermediate
state.

not sure if we can eliminate `struct chromeec_command`.
i think it'll take a fair bit of refactoring of coreboot chromeec support.