python: remove spurious nativesdk dependency

python: remove spurious nativesdk dependency

There's no need to add a dependency on python-crypt_class-native to
nativesdk-openssl as the general dependency there is transformed appropriately.

Presumably this is cruft from back when SDK packages were suffixed instead of
prefixed, and there were mapping problems.

Signed-off-by: Ross Burton <ross.burton@intel.com>