radv: bump minTexelBufferOffsetAlignment to 4
The spec has probably been misinterpreted during RADV bringup.
This fixes GPU hangs with dEQP-VK.binding_model.offset_nonzero.
Fixes: f4e499ec ("radv: add initial non-conformant radv vulkan driver") Signed-off-by: Samuel Pitoiset samuel.pitoiset@gmail.com