UPSTREAM: drm: bridge: dw-hdmi: Merge __hdmi_phy_i2c_write and hdmi_phy_i2c_write

UPSTREAM: drm: bridge: dw-hdmi: Merge __hdmi_phy_i2c_write and hdmi_phy_i2c_write

The latter is just an int wrapper around the former void function that
unconditionally returns 0. As the return value is never checked, merge
the two functions into one.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170117082910.27023-2-laurent.pinchart+renesas@ideasonboard.com
Change-Id: I2b994874fac9869c951a30c8328df883c0bb7821
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
(cherry pick from cc7e96232763ff33418b088b436a564441347b15)