drm/i915/hdcp: switch to drm_dp_dpcd_{read_byte, read_data, write_data}()

Switch to the modern DPCD access functions that return negative error
codes on errors, -EIO for incomplete access, and 0 on success.

This simplifies error handling all over the place. Convert the error
logging to use %pe and ERR_PTR() while at it.

Add comments to the read/write places that depend on the functions that
return the number of bytes read/written for incomplete access.

v2: return length from get_receiver_id_list_rx_info() (Sashiko)

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260921094103.701841-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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