ARM: EXYNOS: Use generic pwm driver in Origen board

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