soc/intel/icelake: Remove redundant gpio.c from Makefile.inc

Change-Id: Ibddc2363e9bfea9ae41e4807435acb2e788dcb93
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34088
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/icelake/Makefile.inc

@@ -42,7 +42,6 @@ ramstage-y += fsp_params.c
 ramstage-y += gpio.c
 ramstage-y += graphics.c
 ramstage-y += gspi.c
-ramstage-y += gpio.c
 ramstage-y += i2c.c
 ramstage-y += lockdown.c
 ramstage-y += memmap.c