[S] Change in coreboot[main]: mb/google/dedede/var/boxy: Wait up for 3s for HPD ready signal

[Derek Huang (Code Review)]

Attention is currently required from: Joey Peng, Paul Menzel, Reka Norman.

Derek Huang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78146?usp=email )

Change subject: mb/google/dedede/var/boxy: Wait up for 3s for HPD ready signal
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Patch Set 9:

(1 comment)

File src/mainboard/google/dedede/variants/boxy/ramstage.c:

https://review.coreboot.org/c/coreboot/+/78146/comment/0886c805_262b7667 :
PS9, Line 54: mdelay(display_timeout_ms);
we need to poll the HPD status instead of adding a delay.