mb/google/dedede: Wait for HPD on dibbi variants

Some Type-C monitors do not immediately assert HPD. If we enter FSP-S
before HDP is asserted, display initialisation may fail. So wait for
HPD.

This is similar to commit b40c6009141e ("mainboard/hatch: Fix puff DP
output on cold boots") on puff, except we don't use
google_chromeec_wait_for_displayport() since that EC command was removed
for TCPMv2 (https://crrev.com/c/4221975). Instead we use the HPD signals
only. By waiting for any HPD signal (Type-C or HDMI), we skip waiting if
HDMI is connected, which is the same behaviour as puff and fizz.

TEST=On dibbi, connect a display via a Type-C to HDMI dongle and check
the dev and recovery screens are now displayed correctly. Also check the
logs in the following cases:

Cold reboot in dev mode, Type-C to HDMI dongle:
HPD ready after 800 ms

Warm reboot in dev mode, Type-C to HDMI dongle:
HPD ready after 0 ms

Cold/warm reboot in dev mode, direct Type-C:
HPD ready after 0 ms

Cold/warm reboot in dev mode, direct HDMI:
HPD ready after 0 ms

Cold/warm reboot in dev mode, no display:
HPD not ready after 3000 ms. Abort.

Change-Id: Id4657b5d5a95a68ecbd9efcf3585cf96ad1e13e1
Signed-off-by: Reka Norman <rekanorman@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78294
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>

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