gpio/xilinx: enable for MIPS

MIPSfpga uses the axi gpio controller. Enable the driver for MIPS.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 63000b1..597b8d4 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -506,7 +506,7 @@
 
 config GPIO_XILINX
 	tristate "Xilinx GPIO support"
-	depends on OF_GPIO && (PPC || MICROBLAZE || ARCH_ZYNQ || X86)
+	depends on OF_GPIO && (PPC || MICROBLAZE || ARCH_ZYNQ || X86 || MIPS)
 	help
 	  Say yes here to support the Xilinx FPGA GPIO device