radv: Add stricter space checks.

radv: Add stricter space checks.

The check for max_dw means that none of checks triggered reliably
when we had an issue. Use a stricter reserved dw measure to increase
the probability of catching issues.

Adds a radeon_check_space to some places after cs_create as they
previously relied on the min. cs size, but that would still trigger
the checks.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20152>