It's likely that the certificate root chain is needed if python3-crypt is
installed, so recommend it.
Also remove the redundant nativesdk-python3-crypt assignment, as the general
form is sufficient when class-extended.
(From OE-Core rev: dd644ee9991e953474d41dbbf713a7e33b4c9141)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>