radv: do not set pending_reset_query in BeginCommandBuffer()

radv: do not set pending_reset_query in BeginCommandBuffer()

This is just useless for two reasons:
1) flush_bits is not set accordingly, so nothing will be flushed
   in BeginQuery().
2) we always flush caches in EndCommandBuffer(), so if a reset
   is done in a previous command buffer we are safe.

Cc: "18.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Alex Smith <asmith@feralinteractive.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>