ChromeOS: Separate NVS from global GNVS

Allocate chromeos_acpi in CBMEM separately from GNVS.

Change-Id: Ide55964ed53ea1d5b3c1c4e3ebd67286b7d568e4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51638
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/include/acpi/acpi.h

@@ -1209,6 +1209,7 @@ void soc_fill_fadt(acpi_fadt_t *fadt);
 void mainboard_fill_fadt(acpi_fadt_t *fadt);
 
 void acpi_fill_gnvs(void);
+void acpi_fill_cnvs(void);
 
 void update_ssdt(void *ssdt);
 void update_ssdtx(void *ssdtx, int i);