power: qpnp-linear-charger: update CHG_CTRL register after boot

Due to PBS updating, register default value may changes,
We should assign definite value during init, to avoid unable
to charge condition.

Change-Id: Iae59f7fcb45e80c58a5a9a60a60dad7cac903aba
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>