power: qpnp-fg: turn on current termination qualification

Sometimes when the batfet is open, a negative current could be read.
This can mess up fuel gauge based charge termination. Turn on the
current termination qualification bit to zero out the negative currents.

Change-Id: I3f3244d0ab634a822758efe6c6845c4d4ab11f0f
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>