power: qpnp-charger: update battery status when boost enabled

Battery status is not updated correctly when boost enabled with charger
connected and battery charged to full. Add some logic in the boost
enable/disable hook function to update the battery status.

CRs-Fixed 688311
Change-Id: I07f7f6c11e206533d30470e78eef246dc15cf871
Signed-off-by: Chunmei Cai <ccai@codeaurora.org>