CheckDeviceFormat with a depth stencil format gives a spurious error
when called with a non-depth-stencil format. We can check the number
of format bits before we call to reduce the error spam.

Change-Id: Ia2a6e6d756c84e13effe298240f33c8c83379267
Reviewed-on: https://chromium-review.googlesource.com/242030Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>