RFC: freedreno: align user const stateobjs to 16 rather than 64
This fixes a gfxbench gl_driver2_off perf regression and brings the fps from 102 to 107 on a618.
Fixes: edca30ef ("freedreno/drm: Fix suballoc alignment")
This is RFC mainly because I don't know how it helps exactly. We could also invert the logic by adding FD_RINGBUFFER_IBO
instead and align to 64 only when the flag is set.