drm/bridge: add ->edid_read hook and drm_bridge_edid_read()

[ Upstream commit d807ad80 ]

Add new struct drm_edid based ->edid_read hook and
drm_bridge_edid_read() function to call the hook.

v2: Include drm/drm_edid.h

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/9d08d22eaffcb9c59a2b677e45d7e61fc689bc2f.1706038510.git.jani.nikula@intel.com


Stable-dep-of: 171b711b ("drm/bridge: lt8912b: do not return negative values from .get_modes()")
Signed-off-by: Sasha Levin <sashal@kernel.org>