chromeos/gnvs: remove function and naming cleanup

- Remove unused acpi_get_chromeos_acpi_info (see CB:28190)
- Make function naming in gnvs.h consistent (start with "chromeos_")

BUG=b:112288216
TEST=compile and run on eve

Change-Id: I5b0066bc311b0ea995fa30bca1cd9235dc9b7d1b
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/28406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/apollolake/acpi.c

@@ -96,7 +96,7 @@ void acpi_create_gnvs(struct global_nvs_t *gnvs)
 
 	if (IS_ENABLED(CONFIG_CHROMEOS)) {
 		/* Initialize Verified Boot data */
-		chromeos_init_vboot(&gnvs->chromeos);
+		chromeos_init_chromeos_acpi(&gnvs->chromeos);
 		gnvs->chromeos.vbt2 = ACTIVE_ECFW_RO;
 	}