radv: emit the initial config only once in the preambles

radv: emit the initial config only once in the preambles

It shouldn't be needed to emit the initial graphics or compute
state when beginning a new command buffer. Emitting them in
the preamble should be enough and this will reduce IB sizes.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>