Recently added depth formats were not recognized and caused an assert.

Change-Id: Ide1c783f183770d40673051ccd48b3f8e689f8db
Reviewed-on: https://swiftshader-review.googlesource.com/15969Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>