power: smb1351-charger: fix USB type detection

Most of the platforms have D+/D- lines routed to USB PHY and the
charger. And almost all the PHYs pull down the D+/D- lines unless
it is set to active mode. This grounding causes issues with
source detection and results in detecting SDP even when it is not.

Fix this by setting ALLOW_DETECTION property to inform the PHY to
remove the pull downs. Once done, rerun APSD and inform of the correct
results via the TYPE and PRESENT property.
The reruns are necessary only if an SDP is detected.

By the way, prevent running APSD when battery is missing. It prevents
brownout.

Change-Id: I472ee8b7fc9673910af206e37dd55b2d1a3fce5d
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>