drm/i915/lspcon: log DPCD access errors

Now that the DPCD accessors return a proper error code, include it in
the error messages using %pe and ERR_PTR(), instead of just stating
that the access failed.

While at it, fix the AVI IF control write error message, which
incorrectly reported a failed read.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Nemesa Garg <nemesa.garg@intel.com>
Link: https://patch.msgid.link/20260922121316.1768918-1-suraj.kandpal@intel.com

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