cbtable: remove chromeos_acpi from cbtable

Since we can derive chromeos_acpi's location from that of
ACPI GNVS, remove chromeos_acpi entry from cbtable and
instead use acpi_gnvs + GVNS_CHROMEOS_ACPI_OFFSET.

BUG=b:112288216
TEST=None
CQ-DEPEND=CL:1179725

Change-Id: I74d8a9965a0ed7874ff03884e7a921fd725eace9
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/28190
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/southbridge/intel/ibexpeak/nvs.h

@@ -152,7 +152,7 @@ typedef struct global_nvs_t {
 	/* ChromeOS specific (starts at 0x100)*/
 	chromeos_acpi_t chromeos;
 } __packed global_nvs_t;
-check_member(global_nvs_t, chromeos, 0x100);
+check_member(global_nvs_t, chromeos, GNVS_CHROMEOS_ACPI_OFFSET);
 
 #ifdef __SMM__
 /* Used in SMM to find the ACPI GNVS address */