Bugfix: upload stencil data in pipeline image util

Bugfix: upload stencil data in pipeline image util

Fixes:
- Upload stencil data to the image with mixed DS formats
- Respect 4 byte offset alignment for formats <4 bytes
- Fix some nonCoherentAtomSize validation errors

Affected tests:
- dEQP-VK.texture.shadow.*d16_unorm
- dEQP-VK.texture.shadow.*x8_d24_unorm_pack32
- dEQP-VK.texture.shadow.*d32_sfloat
- dEQP-VK.texture.shadow.*s8_uint
- dEQP-VK.texture.shadow.*d16_unorm_s8_uint
- dEQP-VK.texture.shadow.*d24_unorm_s8_uint
- dEQP-VK.texture.shadow.*d32_sfloat_s8_uint

Issue #556

Change-Id: I56c0e7eef9c1bfc82790eb8ba6e48b95dc65f521