freedreno: move more batch related tracking to fd_batch

freedreno: move more batch related tracking to fd_batch

To flush batches out of order, the gmem code needs to not depend on
state from fd_context (since that may apply to a more recent batch).
So this all moves into batch.

The one exception is the gmem/pipe/tile state itself.  But this is
only used from gmem code (and batches are flushed serially).  The
alternative would be having to re-calculate GMEM layout on every
batch, even if the dimensions of the render targets are the same.

Note: This opens up the possibility of pushing gmem/submit into a
helper thread.

Signed-off-by: Rob Clark <robdclark@gmail.com>