Change in coreboot[master]: mb/google/trogdor: Adjust mipi panel backlight gpio

[Julius Werner (Code Review)]

Attention is currently required from: zanxi chen.
Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59044 )

Change subject: mb/google/trogdor: Adjust mipi panel backlight gpio
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Patch Set 5:

(3 comments)

File src/mainboard/google/trogdor/board.h:

https://review.coreboot.org/c/coreboot/+/59044/comment/e3c58dc6_877bc52d 
PS5, Line 16: #define GPIO_TP_EN      GPIO(85)
This should be under the #if below, and set to dead_code_t(gpio_t) for eDP boards.

File src/mainboard/google/trogdor/chromeos.c:

https://review.coreboot.org/c/coreboot/+/59044/comment/aa893d37_20807e42 
PS5, Line 18: 		gpio_output(GPIO_TP_EN, 0);
Is this necessary? This pin should already be a pull-down on reset.

File src/mainboard/google/trogdor/mainboard.c:

https://review.coreboot.org/c/coreboot/+/59044/comment/dc8864c0_148d7f3e 
PS5, Line 145: 	if (CONFIG(BOARD_GOOGLE_MRBLAND) || CONFIG(BOARD_GOOGLE_WORMDINGLER))
Why not TROGDOR_HAS_MIPI_PANEL? I hope this part is the same across all MIPI variants?