[U-Boot] [PATCH v4 2/4] rockchip: pwm: implement pwm_set_invert()

[sjg at google.com]

Rockchip pwm need to init polarity, implement pwm_set_invert()
to do it.

Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
Acked-by: Simon Glass <sjg at chromium.org>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/pwm/rk_pwm.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

Applied to u-boot-rockchip/next, thanks!