lynxpoint: Move ACPI NVS into separate CBMEM table

The ACPI NVS region was setup in place and there was a CBMEM
table that pointed to it.  In order to be able to use NVS
earlier the CBMEM region is allocated for NVS itself during
the LPC device init and the ACPI tables point to it in CBMEM.

The current cbmem region is renamed to ACPI_GNVS_PTR to
indicate that it is really a pointer to the GNVS and does
not actually contain the GNVS.

Change-Id: I31ace432411c7f825d86ca75c63dd79cd658e891
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/2970
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/include/cbmem.h

@@ -51,6 +51,7 @@
 #define CBMEM_ID_GDT		0x4c474454
 #define CBMEM_ID_ACPI		0x41435049
 #define CBMEM_ID_ACPI_GNVS	0x474e5653
+#define CBMEM_ID_ACPI_GNVS_PTR	0x474e5650
 #define CBMEM_ID_CBTABLE	0x43425442
 #define CBMEM_ID_PIRQ		0x49525154
 #define CBMEM_ID_MPTABLE	0x534d5054