Change in coreboot[master]: mb/google/guybrush: Add initial I2C configuration

[Mathew King (Code Review)]

Attention is currently required from: Raul Rangel, Furquan Shaikh, Martin Roth, Karthik Ramasubramanian, Karthikeyan Ramasubramanian.
Mathew King has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51543 )

Change subject: mb/google/guybrush: Add initial I2C configuration
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Patch Set 2:

(1 comment)

File src/mainboard/google/guybrush/variants/guybrush/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/51543/comment/479cb8d4_24f12857 
PS2, Line 38: 	# I2C Config
            : 	#+-------------------+---------------------------+
            : 	#| Field             |  Value                    |
            : 	#+-------------------+---------------------------+
            : 	#| I2C0              | Trackpad                  |
            : 	#| I2C1              | Touchscreen               |
            : 	#| I2C2              | Speaker, Codec, P-SAR     |
            : 	#| I2C3              | H1/D2 TPM                 |
            : 	#+-------------------+---------------------------+
            : 	register "i2c[0]" = "{
            : 		.speed = I2C_SPEED_FAST,
            : 	}"
            : 
            : 	register "i2c[1]" = "{
            : 		.speed = I2C_SPEED_FAST,
            : 	}"
            : 
            : 	register "i2c[2]" = "{
            : 		.speed = I2C_SPEED_FAST,
            : 	}"
            : 
            : 	register "i2c[3]" = "{
            : 		.speed = I2C_SPEED_FAST,
            : 	}"
Does this need to be in the variant or can it move to the baseboard?