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/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c
index 94f9381..39020ac 100644
--- a/drivers/pinctrl/pinctrl-abx500.c
+++ b/drivers/pinctrl/pinctrl-abx500.c
@@ -1119,6 +1119,9 @@
 	case PINCTRL_AB8500:
 		abx500_pinctrl_ab8500_init(&pct->soc);
 		break;
+	case PINCTRL_AB9540:
+		abx500_pinctrl_ab9540_init(&pct->soc);
+		break;
 	case PINCTRL_AB8505:
 		abx500_pinctrl_ab8505_init(&pct->soc);
 		break;