mb/google/zork: Drop unused function variant_romstage_entry()

This change drops the function `variant_romstage_entry()` which is
unused on zork.

Change-Id: I140ab3e837971c4c7dbef5d27616043b5fc6c2c9
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43116
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/zork/romstage.c

@@ -8,11 +8,6 @@
 #include <variant/ec.h>
 #include <console/console.h>
 
-void __weak variant_romstage_entry(void)
-{
-	/* By default, don't do anything */
-}
-
 void mainboard_romstage_entry_s3(int s3_resume)
 {
 	size_t num_gpios;
@@ -23,6 +18,4 @@ void mainboard_romstage_entry_s3(int s3_resume)
 	variant_pcie_power_reset_configure();
 
 	mainboard_ec_init();
-
-	variant_romstage_entry();
 }

src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h

@@ -32,7 +32,6 @@ const struct soc_amd_gpio *variant_override_gpio_table(size_t *size);
  */
 const struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size, int slp_typ);
 
-void variant_romstage_entry(void);
 /* Modify devictree settings during ramstage. */
 void variant_devtree_update(void);
 /* Update audio configuration in devicetree during ramstage. */