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/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index 3e71dbd..b7c70e1 100644
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -22,6 +22,7 @@
 	select PINCTRL_DB8540
 	select PINCTRL_AB8500
 	select PINCTRL_AB8505
+	select PINCTRL_AB9540
 	select REGULATOR
 	select REGULATOR_DB8500_PRCMU