zink: store num_inlinable_uniforms separately for cs programs

zink: store num_inlinable_uniforms separately for cs programs

compute is a special case because the zink_shader itself is created
in a thread, which means it cannot be accessed directly at bind time
since it may not have finished creating itself yet

to avoid prematurely waiting on an async fence, the one value needed
at bind time can instead be stored separately

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22266>