layers:Add image layout validation for descriptors

layers:Add image layout validation for descriptors

This change adds validation to make sure that an image layout at the
time the image is used in a descriptor matches the layout that was
given when the descriptor was updated.

Because image view covers a range of mip levels, loop over each level
and verify layouts one at a time.

Also Updated a number of validate functions to use cont ptr params for
data that they aren't changing.