power: qpnp-smbcharger: fix system temperature ICL

The current limits from the system temperature levels were being
overwritten by the UVLO work around. Fix this by always checking for the
system temperature level when setting the usb input current limits.

CRs-Fixed: 711310
Change-Id: I025c53b1b1bf713d2bce74727845ad0df1a4af3a
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>