drm/bridge: Add PTN3460 bridge driver

This patch adds a drm_bridge driver for the PTN3460 DisplayPort to LVDS
bridge chip.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --cc Documentation/devicetree/bindings/drm/bridge/ptn3460.txt
Simple merge

diff --cc drivers/gpu/drm/Kconfig
Simple merge

diff --cc drivers/gpu/drm/Makefile
Simple merge

diff --cc drivers/gpu/drm/bridge/Kconfig
Simple merge

diff --cc drivers/gpu/drm/bridge/Makefile
Simple merge

diff --cc drivers/gpu/drm/bridge/ptn3460.c
Simple merge

diff --cc include/drm/bridge/ptn3460.h
Simple merge