Utilize copyBufferToImage framework function where possible

Utilize copyBufferToImage framework function where possible

Several existing tests have their own implementation for
copying buffer to an image. Use a framework function where
it leads to a cleaner code.

Affects:

dEQP-VK.binding_model.shader_access.*
dEQP-VK.compute.basic.copy_image_to_ssbo*
dEQP-VK.geometry.basic.*
dEQP-VK.image.atomic_operations.*
dEQP-VK.multiview.*
dEQP-VK.glsl.*
dEQP-VK.spirv_assembly.instruction.graphics.*
dEQP-VK.texture.explicit_lod.*

Components: Vulkan, Framework

VK-GL-CTS issue: 1376
Change-Id: Icfda7bdde1e8e0a7bf77ccb36bf4ca948d45a200