power: charger: fix a bug about repo soc is 100 when vbat is low

When repeat charge flag is true, the repo soc is 100 even if the real soc is low, such as 80.
So when the real capacity is low, we clear the repeat charge flag.

Change-Id: I8b04c93c0b881dfcab1e72a851232c4148e1ae8a