nb/intel/ironlake: Decouple `setup_heci_uma()` from northbridge

Remove all northbridge dependencies in the `setup_heci_uma()` function.
Update its signature to not pull in raminit internals and drop a dummy
read that doesn't have any side-effects (it's probably a leftover from
a replay of vendor firmware). This code will be moved into southbridge
scope in a follow-up.

Change-Id: Ie5b5c5f374e19512c5568ee8a292a82e146e67ad
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61930
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

0 files changed, 0 insertions, 0 deletions