nb/intel: Factor out common MRC code

Remove code duplication and use the common function
store_current_mrc_cache instead.
No functionality is changed.

Tested on Sandybridge Lenovo T520.

Change-Id: I4aa5463f1b1d5e1afbe44b4bfc659524d86204db
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/15074
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
6 files changed