radeonsi: has_kernelq_reg_shadowing failure means driver failed

If register shadowing enabling failed, then driver ctx init will
fail instead of disabling register shadowing.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35106>
5 files changed