pinctrl/abx500: add AB9540 sub-driver

Add AB9540 sub driver to the ABx500 family, pins, pin groups and
gpio range.

As the pin controller (also the ABx500 controllers) is an
inherent part of the SoC and will prevent boot if not
available, select this from the Ux500 SoC Kconfig.

Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Patrice Chotard <patrice.chotard@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index e7db9fa..aea4ceb 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -37,6 +37,10 @@
 	bool "AB8500 pin controller driver"
 	depends on PINCTRL_ABX500 && ARCH_U8500
 
+config PINCTRL_AB9540
+	bool "AB9540 pin controller driver"
+	depends on PINCTRL_ABX500 && ARCH_U8500
+
 config PINCTRL_AB8505
 	bool "AB8505 pin controller driver"
 	depends on PINCTRL_ABX500 && ARCH_U8500