intel/debug: allow silencing CL warnings

Useful for CI and users previously aware of the warning.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29691>

src/intel/dev/intel_debug.c

@@ -107,6 +107,7 @@ static const struct debug_control debug_control[] = {
    { "bat-stats",   DEBUG_BATCH_STATS },
    { "reg-pressure", DEBUG_REG_PRESSURE },
    { "shader-print", DEBUG_SHADER_PRINT },
+   { "cl-quiet",     DEBUG_CL_QUIET },
    { NULL,    0 }
 };