ARM: kirkwood: SBx81LIFXCAT: disable KIRKWOOD_GPIO

DM_GPIO was already enabled so the MVEBU_GPIO was already available.
Disable KIRKWOOD_GPIO as it was unnecessary.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/SBx81LIFXCAT_defconfig b/configs/SBx81LIFXCAT_defconfig
index 9d57909..cb80b78 100644
--- a/configs/SBx81LIFXCAT_defconfig
+++ b/configs/SBx81LIFXCAT_defconfig
@@ -42,7 +42,6 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_NETCONSOLE=y
 CONFIG_DM=y
-CONFIG_KIRKWOOD_GPIO=y
 CONFIG_DM_PCA953X=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MVTWSI=y