ARM: STi: STiH416: Add Pinctrl settings for PWM

Supply the Pinctrl configuration to enable PWM{0,1} lines on STiH416
based development boards.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>