usb: dwc3: Add check for SDP charger type

During boot up when device is connected to CDP,
driver is checking for floating charger, which is not required
as PMIC has notified appropriate charger type already.
So, check for floating charger only in case of SDP.

Change-Id: Ia0b37742f86e2374eaeb1b06870f1c7a9ac01cb1
CRs-fixed: 2053529
Signed-off-by: Sai Krishna Juturi <jsaikrishna@codeaurora.org>