drm/bridge: add support for lontium lt8713sx bridge driver

drm/bridge: add support for lontium lt8713sx bridge driver

The lt8713sx is a Type-C/DP1.4 to 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 and enabling 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>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Cc: Simon Zhu <xmzhu@lontium.corp-partner.google.com>
Link: https://patch.msgid.link/20260303-lt8713sx-bridge-driver-v5-2-6cc2a855aafa@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>