UPSTREAM: nb/intel/gm45: Use LAPIC udelay instead of custom version

This change may slow down the raminit by maximum 200usec,
but reuses the lapic udelay definition.

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/17152
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

Change-Id: I60a68f8a7911b257c0eecda96f7c5bf302bb51ed
Reviewed-on: https://chromium-review.googlesource.com/408994
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
5 files changed