power: qpnp-smb5: add property to show fake charging status

Add "qcom,fake-chg-status-on-debug-batt" property to show
charging status as unknown when debug battery is present.

Change-Id: Ieab27bd9c2c2c44925057c4d9f2c634c93b3925d
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>