macloader: Add support to set nvram calibration file.

Change-Id: I0eb99ad6084eb8cd4452a91b13dd75384785f5a8
Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit e283a09f99d0cbad2cf8b903ffe2da1c3e44663e)
2 files changed