UPSTREAM: drm: bridge: dw-hdmi: Assert SVSRET before resetting the PHY

UPSTREAM: drm: bridge: dw-hdmi: Assert SVSRET before resetting the PHY

According to the PHY IP core vendor, the SVSRET signal must be asserted
before resetting the PHY. Tests on RK3288 and R-Car Gen3 showed no
regression, the change should thus be safe.

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/20170117082910.27023-20-laurent.pinchart+renesas@ideasonboard.com
Change-Id: I41d4ae5fe19266c430589a254ed1e44120d30ee8
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
(cherry pick from 2668db37888ff63282147b00dcf54fa491831df3)