power: smb358-charger: Workaround for frequent recharge issue

When battery voltage(Vbatt) is higher than around 4.2v, and
charging is disabled, Charger stops switching. In such a
case, system load is provided by battery rather than input,
even though input is still connected. As a workaround, we need
make reg09[0:3] to be a non-zero value which keeps the switcher
active.

Change-Id: I94459eb5e65013edb9977fc742f83be4901d5f35
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>