Change in coreboot[master]: mb/google/brya/var/vell: Add MIPI camera support

[Shon Wang (Code Review)]

Attention is currently required from: Tim Wawrzynczak, Kevin Chiu, Jimmy Su, Robert Chen, Wisley Chen.
Shon Wang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60275 )

Change subject: mb/google/brya/var/vell: Add MIPI camera support
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Patch Set 4:

(4 comments)

File src/mainboard/google/brya/variants/vell/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/60275/comment/fbb244ea_a0338998 
PS4, Line 133: 2
> This value should be "4".  […]

I fix it in here
https://review.coreboot.org/c/coreboot/+/60276
thank you

https://review.coreboot.org/c/coreboot/+/60275/comment/6c20ec96_10764fa6 
PS4, Line 235: OVTI2740
> Please change the HID name as "OVTI8856"

Done

https://review.coreboot.org/c/coreboot/+/60275/comment/f770be9e_5d621a23 
PS4, Line 238: Ov 2740 Camera
> The chip name should be aligned with driver. […]

Done

https://review.coreboot.org/c/coreboot/+/60275/comment/057869c0_a192bcc5 
PS4, Line 242: 				register "ssdb.lanes_used" = "2"
             : 				register "ssdb.link_used" = "1"
             : 				register "num_freq_entries" = "1"
             : 				register "link_freq[0]" = "DEFAULT_LINK_FREQ"
> please correct to the below content to align with driver settings […]

Done