* adding support for map/unmap
* adding support for origin/region validation with mipmaps
* fixing slices returned in map/unmap
* removing ambiguity around mipLevel naming
* enabling cl_khr_mipmap_image in current shape
* enabling cl_khr_mipmap_image_writes in current shape
* fixing CompileProgramWithReraFlag test
Change-Id: I0c9d83028c5c376f638e45151755fd2c7d0fb0ab