Buffer usage was ignored in memory requirements. Usage support
was added for the purpose of computing the proper required alignment.

Fixes:
dEQP-VK.memory.requirements.core.buffer.regular

Bug b/118383648

Change-Id: Ib66e8d85f1b468765e24edba598fa06f4b5888c9
Reviewed-on: https://swiftshader-review.googlesource.com/c/23928
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>