freedreno/a5xx: don't align height for PIPE_BUFFER

Buffers can be large, so we probably don't want to make them all 32x
bigger.  But they can't be rendered to (at least in GL) so we don't
need this workaround to prevent page faults on mem<->gmem.

Cc: "18.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
(cherry picked from commit 2f175bfe)