bindings: 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: I7e9052285473f39477f5bf21e0cae10d1fdd8970
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>