soc/intel/quark: Initialize MTRRs in bootblock

Initialize the MTRRs for use by bootblock and romstage.
Display the MTRRs.

TEST=Build and run on Galileo Gen2.

Change-Id: Ib1d422c738820163f54771c65034ae77301237ec
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15861
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/quark/include/soc/reg_access.h

@@ -20,6 +20,7 @@
 
 #include <arch/io.h>
 #include <cpu/x86/msr.h>
+#include <cpu/x86/mtrr.h>
 #include <delay.h>
 #include <fsp/util.h>
 #include <reg_script.h>