soc/braswell: Fix Global NVS base address

TEST=Boot to OS
Signed-off-by: Hannah Williams <hannah.williams@intel.com>

Change-Id: I9b43eb4f6f7af62a8a0bbe7bfa08feee1eaca24e
Reviewed-on: https://review.coreboot.org/13506
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/braswell/acpi/globalnvs.asl

@@ -25,8 +25,9 @@ Name(\PICM, 0)		/* IOAPIC/8259 */
  * we have to fix it up in coreboot's ACPI creation phase.
  */
 
+External (NVSA)
 
-OperationRegion (GNVS, SystemMemory, 0xC0DEBABE, 0x2000)
+OperationRegion (GNVS, SystemMemory, NVSA, 0x2000)
 Field (GNVS, ByteAcc, NoLock, Preserve)
 {
 	/* Miscellaneous */