[M] Change in coreboot[main]: mb/google/rauru: Implement regulator interface

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Hope Wang, Hung-Te Lin, Jarried Lin, Yidi Lin.

Yu-Ping Wu has posted comments on this change by Jarried Lin. ( https://review.coreboot.org/c/coreboot/+/85563?usp=email )

Change subject: mb/google/rauru: Implement regulator interface
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Patch Set 2: Code-Review+1

(2 comments)

File src/mainboard/google/rauru/regulator.c:

https://review.coreboot.org/c/coreboot/+/85563/comment/28a9e3d7_e16d0d40?usp... :
PS2, Line 31: if (id == MT6373_VMCH)
            : 		mt6373_set_vmch_voltage(voltage_uv);
            : 	else if (id == MT6373_VMC)
            : 		mt6373_set_vmc_voltage(voltage_uv);
Use switch.

https://review.coreboot.org/c/coreboot/+/85563/comment/111d5eb6_c3f1c9e3?usp... :
PS2, Line 36: BIOS_WARNING
This should be an error, right?