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>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d374320..d3b2953 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -416,7 +416,7 @@
 
 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