Fix failure when USB cable is connected:
smb347 2-006a: reading IRQSTAT_D failed

Fixes: 1502cfe1 ("smb347-charger: Fix battery status reporting logic for charger faults")
Tested-by: NDavid Heidelberg <david@ixit.cz>
Signed-off-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NDavid Heidelberg <david@ixit.cz>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.com>