soc/intel/quark: Enable ESRAM

The Quark SoC uses ESRAM instead of cache-as-RAM.  This code requires
that utils/xcompile/xcompile change the machine architecture from i686
to i586 to ensure that the Quark does not attempt to execute unsupported
instructions:

*  Adjust Makefile.inc to add the RMU to the coreboot image
*  Add code to enable the ESRAM

Directly use the QuarkSocPkg/QuarkNorthCluster/Include/QuarkNcSocId.h
file from the EDK2 tree (https://github.com/tianocore/edk2.git) to
enable
easy differences and correct issues in coreboot that were found in EDK2.

Testing on Galileo:
*  Edit the src/mainboard/intel/galileo/Makefile.inc file
   *  Add "select ADD_RMU_FILE"
*  Place the rmu.bin file in the location specified by CONFIG_RMU_FILE
*  Remove power from the board
*  Apply power to the board
*  Testing is successful if the SD LED is on indicating that the end of
   esram_init.inc was reached

Change-Id: I91d919da144bb72a5d4c4a8050ffab256632a395
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/13440
Tested-by: build bot (Jenkins)
Reviewed-by: FEI WANG <wangfei.jimei@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/quark/memmap.c

@@ -14,6 +14,13 @@
  */
 
 #include <cbmem.h>
+#include <fsp/memmap.h>
+
+size_t mmap_region_granularity(void)
+{
+	/* Align to 8 MiB by default */
+	return 8 << 20;
+}
 
 void *cbmem_top(void)
 {