power: smb358-charger: Conditionally update battery status in term handler

On SMB, battery termination status updates even when we disable
charging termination. Handle this case by updating the battery status
only if required.

CRs-Fixed: 771020
Change-Id: I37f703d423785e23fd90a7736ffd13ffaf10982f
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>