gpio: ab8500: Mark broken

This driver is broken in several aspects.

 1) old style irq_chip functions. Sigh

 2) Abuse of the unlock callback. That's not supposed to be a state
    machine for evrything and some more.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/gpio/Kconfig

@@ -416,7 +416,7 @@ config GPIO_JANZ_TTL
 
 config AB8500_GPIO
 	bool "ST-Ericsson AB8500 Mixed Signal Circuit gpio functions"
-	depends on AB8500_CORE
+	depends on AB8500_CORE && BROKEN
 	help
 	  Select this to enable the AB8500 IC GPIO driver
 endif