python3-charset-normalizer: make python3-charset-normalizer recipe native

python3-charset-normalizer will be used by build system.
This is a part of the preparation steps for oniro integration tests which uses
checkbox-ng.

Signed-off-by: Le Van Quach <levan.quach@kalpa.it>

meta-oniro-staging/recipes-extended/python3/python3-charset-normalizer_2.1.0.bb

@@ -18,3 +18,5 @@ RDEPENDS:${PN} += " \
 	${PYTHON_PN}-codecs \
 	${PYTHON_PN}-json \
 "
+
+BBCLASSEXTEND = "native"