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/soc/intel/apollolake/include/soc/nvs.h

@@ -53,6 +53,6 @@ typedef struct global_nvs_t {
 	/* ChromeOS specific (0x100 - 0xfff) */
 	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);
 
 #endif	/* _SOC_APOLLOLAKE_NVS_H_ */