soc/intel/quark: Split out MTRR support

Split out the MTRR support into a new module: mtrr.c.

TEST=Build and run on Galileo

Change-Id: Ib9ec479d171dbbc062509e14fbe246f6d90e903a
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/13895
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
3 files changed