Minor fixes for CL_UNORM_SHORT_565, CL_UNORM_SHORT_555 (#1129)

* Minor fixes for CL_UNORM_SHORT_565, CL_UNORM_SHORT_555

* Fix verification for undefined bit
* Relax current infinitely precision requirement for these formats
  and move check in common function.
* Add proper debug output.

Signed-off-by: John Kesapides <john.kesapides@arm.com>

* Minor Formating fix.

Signed-off-by: John Kesapides <john.kesapides@arm.com>
7 files changed