[M] Change in coreboot[main]: mb/google/rauru: Add panel driver in mainboard

[Yu-Ping Wu (Code Review)]

Attention is currently required from: 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/+/85951?usp=email )

Change subject: mb/google/rauru: Add panel driver in mainboard
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Patch Set 12:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/85951/comment/7c75d000_44ff8090?usp... :
PS12, Line 19: gpio_output(GPIO_AP_EDP_BKLTEN, 0);
             : 	gpio_output(GPIO_BL_PWM_1V8, 0);
This should be extracted to `configure_backlight`, and be assigned to `oled_panel.configure_backlight`, similar to panel.c. Therefore, as the file size isn't quite large, how about merging this file into panel.c?