sh: replace CONFIG_GENERIC_GPIO by CONFIG_GPIOLIB

SH GPIO drivers all use gpiolib and CONFIG_GENERIC_GPIO is only selected
through CONFIG_GPIOLIB, yet some compilation units depended on
CONFIG_GENERIC_GPIO. Make them depend on CONFIG_GPIOLIB instead since it
is more accurate and prepares us for the future removal of
CONFIG_GENERIC_GPIO.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

arch/sh/boards/mach-sdk7786/Makefile

@@ -1,4 +1,4 @@
 obj-y	:= fpga.o irq.o nmi.o setup.o
 
-obj-$(CONFIG_GENERIC_GPIO)	+= gpio.o
+obj-$(CONFIG_GPIOLIB)		+= gpio.o
 obj-$(CONFIG_HAVE_SRAM_POOL)	+= sram.o