cpu/x86: Support CPUs without rdmsr/wrmsr instructions

Quark does not support the rdmsr and wrmsr instructions.  In this case
use a SOC specific routine to support the setting of the MTRRs.  Migrate
the code from FSP 1.1 to be x86 CPU common.

Since all rdmsr/wrmsr accesses are being converted, fix the build
failure for quark in lib/reg_script.c.  Move the soc_msr_x routines and
their depencies from romstage/mtrr.c to reg_access.c.

TEST=Build and run on Galileo Gen2

Change-Id: Ibc68e696d8066fbe2322f446d8c983d3f86052ea
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15839
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/x86/Kconfig

@@ -153,3 +153,10 @@ config BOOT_MEDIA_SPI_BUS
 	depends on SPI_FLASH
 	help
 	 Most x86 systems which boot from SPI flash boot using bus 0.
+
+config SOC_SETS_MSRS
+	bool
+	default n
+	help
+	  The SoC requires different access methods for reading and writing
+	  the MSRs.  Use SoC specific routines to handle the MSR access.