gpio: delete AB8500 driver

The AB8500 GPIO driver has been marked BROKEN for ages, and we
have something better in store: a shiny new pinctrl driver. So
let use delete this old driver as the first step.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -657,12 +657,6 @@ config GPIO_JANZ_TTL
 	  This driver provides support for driving the pins in output
 	  mode only. Input mode is not supported.
 
-config GPIO_AB8500
-	bool "ST-Ericsson AB8500 Mixed Signal Circuit gpio functions"
-	depends on AB8500_CORE && BROKEN
-	help
-	  Select this to enable the AB8500 IC GPIO driver
-
 config GPIO_TPS6586X
 	bool "TPS6586X GPIO"
 	depends on MFD_TPS6586X

drivers/gpio/Makefile

@@ -10,7 +10,6 @@ obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
 obj-$(CONFIG_GPIO_GENERIC)	+= gpio-generic.o
 
 obj-$(CONFIG_GPIO_74X164)	+= gpio-74x164.o
-obj-$(CONFIG_GPIO_AB8500)	+= gpio-ab8500.o
 obj-$(CONFIG_GPIO_ADNP)		+= gpio-adnp.o
 obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o