ARM: multi_v7_defconfig: Enable ST's PWM driver

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

arch/arm/configs/multi_v7_defconfig

@@ -784,7 +784,7 @@ CONFIG_PWM_SUN4I=y
 CONFIG_PWM_TEGRA=y
 CONFIG_PWM_VT8500=y
 CONFIG_PHY_HIX5HD2_SATA=y
-CONFIG_PWM_STI=m
+CONFIG_PWM_STI=y
 CONFIG_PWM_BCM2835=y
 CONFIG_OMAP_USB2=y
 CONFIG_TI_PIPE3=y