When staging updates to the vkImage based on texture base/max level
change, we weren't properly handling texture 2Darray.

This CL changes several helpers to explicitly accept Vulkan extents
and offsets so it is clear how things should be treated.

Bug: angleproject:3991
Test: dEQP-GLES3.functional.shaders.texture_functions.texturesize.*sampler2darray*
Change-Id: Iae80ce7201180224fc3bb7823f21a360950c515d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1854020Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tobin Ehlis <tobine@google.com>
Commit-Queue: Cody Northrop <cnorthrop@google.com>