mb/siemens/mc_apl1: Move gpio.c from baseboard to mc_apl1

Variant mc_apl1 is the only one that uses gpio.c from baseboard. For
this reason, gpio.c is moved from baseboard to mc_apl1.

Change-Id: Ie2ba8181dfe887df9abbbd648f2cbdc6ffc65530
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54945
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/mainboard/siemens/mc_apl1/variants/baseboard/Makefile.inc

@@ -1,5 +1,2 @@
-bootblock-y += gpio.c
 
 romstage-y += memory.c
-
-ramstage-y += gpio.c

src/mainboard/siemens/mc_apl1/variants/mc_apl1/Makefile.inc

@@ -1,2 +1,5 @@
+bootblock-y += gpio.c
+
+ramstage-y += gpio.c
 ramstage-y += mainboard.c
 ramstage-y += lcd_panel.c