Miscellaneous AMD F14 warning fixes

This commit adds in some more fixes to AMD F14 compile
warnings.  The change in the mtrr.c file is in prep-
aration for changes yet to com, but it is currently
innocuous.

Change-Id: I6b204fe0af16a97d982f46f0dfeaccc4b8eb883e
Signed-off-by: Frank Vibrans <frank.vibrans@amd.com>
Signed-off-by: efdesign98 <efdesign98@gmail.com>
Reviewed-on: http://review.coreboot.org/133
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
4 files changed