anv: fix alignments for uniform buffers

anv: fix alignments for uniform buffers

We were not consistent with minimums reported in the physical device
properties.

Fixes a few CTS tests :
   dEQP-VK.memory.requirements.dedicated_allocation.buffer.regular
   dEQP-VK.memory.requirements.extended.buffer.regular
   dEQP-VK.memory.requirements.core.buffer.regular

v2: Use define for the limit

v3: Rename define

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: a0de2e0090535b ("anv: increase minUniformBufferOffsetAlignment to 64")
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4940>