UPSTREAM: drm: bridge: dw-hdmi: Embed drm_bridge in struct dw_hdmi

UPSTREAM: drm: bridge: dw-hdmi: Embed drm_bridge in struct dw_hdmi

The drm_bridge instance is always needed, there's no point in allocating
it separately.

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/20170117082910.27023-5-laurent.pinchart+renesas@ideasonboard.com
Change-Id: Iba5ca73877c3611148af51c0993276eac982bb3e
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
(cherry pick from 70c963ec4f15a13197524611875168f23acc4a97)