ac/surface: use align with NPOT for estimating surface size

ac_estimate_size() triggers an assertion because the block size isn't
aligned to a power of two for ASTC formats.

Cc: mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35879>
1 file changed