drm/i915/hdcp: Pass drm_dp_aux to read_bcaps function

Pass drm_dp_aux to intel_dp_hdcp_read_bcaps function
so as to aid in reading the bcaps for the remote monitor
later on.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240223081453.1576918-6-suraj.kandpal@intel.com