spi/pl022: mark driver non-experimental

This driver has no TODO, and is now used on several platforms:
ARM, U300, Ux500, SPEAr and more. So drop the EXPERIMENTAL
requirement.
Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/spi/Kconfig

@@ -271,8 +271,8 @@ config SPI_ORION
 	  This enables using the SPI master controller on the Orion chips.
 
 config SPI_PL022
-	tristate "ARM AMBA PL022 SSP controller (EXPERIMENTAL)"
-	depends on ARM_AMBA && EXPERIMENTAL
+	tristate "ARM AMBA PL022 SSP controller"
+	depends on ARM_AMBA
 	default y if MACH_U300
 	default y if ARCH_REALVIEW
 	default y if INTEGRATOR_IMPD1