southbridge/intel/bd82x6x: Use common gpio.c

Use shared gpio code from common folder.
Bd82x6x's gpio.c and gpio.h is used by other southbridges
as well and will be removed once it is unused.

Change-Id: I8bd981c4696c174152cf41caefa6c083650d283a
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/13614
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/southbridge/intel/bd82x6x/Kconfig b/src/southbridge/intel/bd82x6x/Kconfig
index 0338b28..6bb488c 100644
--- a/src/southbridge/intel/bd82x6x/Kconfig
+++ b/src/southbridge/intel/bd82x6x/Kconfig
@@ -35,6 +35,7 @@
 	select COMMON_FADT
 	select ACPI_SATA_GENERATOR
 	select HAVE_INTEL_FIRMWARE
+	select SOUTHBRIDGE_INTEL_COMMON_GPIO
 
 config EHCI_BAR
 	hex