pinctrl: Add STM32F746 MCU support

This patch which adds STM32F746 pinctrl and GPIO support, relies on the
generic STM32 pinctrl driver.

Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/stm32/Makefile b/drivers/pinctrl/stm32/Makefile
index fc17d42..4a1ee74 100644
--- a/drivers/pinctrl/stm32/Makefile
+++ b/drivers/pinctrl/stm32/Makefile
@@ -3,3 +3,4 @@
 
 # SoC Drivers
 obj-$(CONFIG_PINCTRL_STM32F429)	+= pinctrl-stm32f429.o
+obj-$(CONFIG_PINCTRL_STM32F746)	+= pinctrl-stm32f746.o