ARM: dts: Add PWM related pinctrl entries for exynos4210

PWM nodes are added to EXYNOS4210 pinctrl DT file.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>