gpio: timberdale: simplify dependencies

GPIO_TIMBERDALE doesn't need an explicit dependency on HAS_IOMEM,
because it depends on MFD_TIMBERDALE which itself depends on
HAS_IOMEM already.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -740,7 +740,7 @@ config GPIO_SODAVILLE
 
 config GPIO_TIMBERDALE
 	bool "Support for timberdale GPIO IP"
-	depends on MFD_TIMBERDALE && HAS_IOMEM
+	depends on MFD_TIMBERDALE
 	---help---
 	Add support for the GPIO IP in the timberdale FPGA.