drm/display: bridge_connector: move audio_infoframe checks to OP_HDMI

drm/display: bridge_connector: move audio_infoframe checks to OP_HDMI

There are DRM_BRIDGE_OP_HDMI_AUDIO bridges (e.g. Lontium LT9611UXC)
which don't implement DRM_BRIDGE_OP_HDMI and don't implement
hdmi_clear_audio_infoframe / hdmi_write_audio_infoframe callbacks.

Move corresponding checks under the DRM_BRIDGE_OP_HDMI condition, making
sure that we require those callbacks only from the bridges which are
actually going to use them.

Fixes: b626b1a1c9cc ("drm/bridge: refactor HDMI InfoFrame callbacks")
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patch.msgid.link/20260126-drm-fix-lt9611uxc-v1-1-04a635a8f5cf@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>