Don't branch on PID in huion_report_fixup

Replace report descriptor with the one from drvdata in
huion_report_fixup, regardless of the PID, as drvdata is initialized
unconditionally and PID-branched report descriptor assignment is done in
huion_probe already.

This removes unnecessary model branching duplication, preventing future
mistakes.
Enable Yiynova tablets also

Invoke huion_tablet_enable for Yiynova tablets also.
This fixes Yiynova tablet enabling.