ACPI: Drop redundant ChromeOS setup for GNVS

Already done in common gnvs_get_or_create() implementation
once gnvs_chromeos_ptr() is defined for platforms.

Change-Id: I90fa2bc28ae76da734b3f88be057435aed9fe374
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48703
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/acpi/chromeos-gnvs.c

@@ -4,12 +4,6 @@
 #include <ec/google/chromeec/ec.h>
 #include <vendorcode/google/chromeos/gnvs.h>
 
-/* Remove once implemented on platform code. */
-__weak void *gnvs_chromeos_ptr(struct global_nvs *gnvs)
-{
-	return NULL;
-}
-
 void gnvs_assign_chromeos(void)
 {
 	chromeos_acpi_t *gnvs_chromeos = gnvs_chromeos_ptr(acpi_get_gnvs());