layers:Check reqs before call to BindImageMemory

layers:Check reqs before call to BindImageMemory

There's an implicit spec requirement that GetImageMemoryRequirements()
should be called prior to calling BindImageMemory() b/c various return
values from GetImageMemoryRequirements() are expected to be complied
with.

This change adds a warning if GetImageMemoryRequirements() has not
been called prior to BindImageMemory(). In this case it will make the
call itself in order to populate internal state tracking.