Disable docs creation for now it uses po4a and sgmltools-lite which are
not currently part of OE-Core
(From OE-Core rev: 5cab5935d6924e0aca5da4b682bb83e54f20bc1d)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>