Change in coreboot[master]: src/ec/google/chromeec: Add and modify APIs for USB-C DP ALT mode

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Furquan Shaikh, Derek Huang, Brandon Breitenstein, Curtis Chen.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57138 )

Change subject: src/ec/google/chromeec: Add and modify APIs for USB-C DP ALT mode
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Patch Set 5:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/57138/comment/fb612e59_1a5ae64a 
PS5, Line 1513: TYPEC_CONTROL_COMMAND_ENTER_MODE
I assume these (and other undefined symbols) come from `ec_commands.h` ?

If so, to uprev that file:
1) copy directly from the HEAD of EC repository
2) change the copyright header to match what it is in this repository

see `git log` on that file for examples