power: smb5-lib: add USBIN_OV de-bounce support

Add support to de-bounce USBIN_OV signal, during de-bounce
period charger driver reports battery status as CHARGING
if USB is present and input path is not suspended.

Change-Id: I9f34e33ce1a43d6f81f147e02ea1ed36ea5b8318
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>