Add "BBCLASSEXTEND = "native"" to recipes

Add "BBCLASSEXTEND = "native"" only if they are not in the
native_tizen_generic_blacklist.

Signed-off-by: Kévin THIERRY <kevin.thierry@open.eurogiciel.org>
Replace 'generic' with 'common' in .spec2yoctorc

Note that 'generic' keyword can still be found in this file; they are
either part of URL or file/directory names. This will need to be
modified as well.

Signed-off-by: Kévin THIERRY <kevin.thierry@open.eurogiciel.org>