power: smb1360: Fix issue for property CHARGING_ENABLED reporting

Bit0 of register 0x4B stands for whether it is in charging status,
not enabling status. Fix this by using a variable to indicate.

Change-Id: I5b9bfdb86ea141fef019f6ed1689ab251732c3a9
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>