power: smb-lib: Set charge current to 100mA when USB is not enumerated

In case of wearables, USB enumeration may fail due to the unclean USB
pins. In this case USB driver notifies charger driver with -ETIMEDOUT.
Set charge current to minimum of 100mA to enable charging.

Change-Id: I9bc87fb3e22841c2e89736c70b71a29428311d31
Signed-off-by: Umang Chheda <uchheda@codeaurora.org>