radeonsi: add uses_kernelq_reg_shadowing in struct si_context

sctx->uses_kernelq_reg_shadowing instead of sctx->shadowing.registers
for register shadowing enable check.

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