[IA64] gpio: GENERIC_GPIO default must be n

Since GPIOLIB is optional on ia64, GENERIC_GPIO must not be selected by
default.  If GPIOLIB is enabled, it will select GENERIC_GPIO.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/Kconfig

@@ -92,7 +92,7 @@ config HAVE_SETUP_PER_CPU_AREA
 	def_bool y
 
 config GENERIC_GPIO
-	def_bool y
+	bool
 
 config DMI
 	bool