FROMLIST: drm/bridge: add support for lontium lt8713sx bridge driver

The lt8713sx is a Type-C/DP1.4 to Type-C/DP1.4/HDMI2.0 converter,
with three configurable DP1.4/HDMI2.0/DP++ output interfaces and
audio output interface.

Driver is required for firmware upgrade in the bridge chip.

Co-developed-by: Prahlad Valluru <vvalluru@qti.qualcomm.com>
Signed-off-by: Prahlad Valluru <vvalluru@qti.qualcomm.com>
Signed-off-by: Vishnu Saini <vishnu.saini@oss.qualcomm.com>
Link: https://lore.kernel.org/all/20251228-lt8713sx-bridge-driver-v3-2-9169fbef0e5b@oss.qualcomm.com/

Author: quic-vishsain