python-six: remove duplicated recipe
Since commit [e3392ec python-six: put python2/3 variant together] applied,
python-six recipe was moved to meta-oe, but not remove the duplicated one
The python3-six recipe and python-six.inc is in oe-core
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>