defconfig: lahaina-gki: enable qpnp-power-on driver

Enable the qpnp-power-on driver so that the desired power off
type can be configured (i.e. shutdown, reset, or warm reset).

Change-Id: I9e1d0157423c4d032fd5d948af1b008d7851310e
Signed-off-by: David Collins <collinsd@codeaurora.org>