defconfig: kona: enable qpnp-power-on driver

Enable the qpnp-power-on driver so that PMIC keys can be used
and reset vs shutdown behaviors can be exercised.

Change-Id: I1b88d28c7b3757d755bbe23048d8b1f05eb9073f
Signed-off-by: David Collins <collinsd@codeaurora.org>