boards: frdm_kw41z: Default to daplink firmware and pyocd runner

The frdm_kw41z board was originally configured in zephyr to use the
jlink runner by default because pyocd didn't yet support the kw41z soc.
Support for kw41z was added in pyocd v0.9.0, so we can now default to
daplink firmware and pyocd.

Now all freedom boards in zephyr consistently use daplink and pyocd.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>