broadwell: Flatten acpi_init_gnvs function

Instead of relying on mainboards to call it, do like Lynx Point.

Change-Id: Idb7457e0734e19d0a26f0762079e273b6e740475
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46793
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/wtm2/acpi_tables.c

@@ -9,8 +9,6 @@
 
 void acpi_create_gnvs(struct global_nvs *gnvs)
 {
-	acpi_init_gnvs(gnvs);
-
 	/* Enable USB ports in S3 */
 	gnvs->s3u0 = 1;