drm/amdkfd: report dispatch id always saved in ttmps after gc9.4.2

The feature to save the dispatch ID in trap temporaries 6 & 7 on context
save is unconditionally enabled during MQD initialization.

Now that TTMPs are always setup regardless of debug mode for GC 9.4.3, we
should report that the dispatch ID is always available for debug/trap
handling.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>