power: smb358-charger: Explictly enable/disable charging during boot

Call charging enable/disable function explicitly during boot.
It makes sure charging is enabled correctly regardless of the default
setting.

Change-Id: I2dc82fb1864c34a92d5309cb3543d27132a11db1
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>