ehci: omap: add HSIC disconnect-reconnect functionality

Added HSIC disconnect-reconnect functionality using AUX pin.
Disconnect or reconnect may be initiated by Device
(using AUX pin) as well as by Host (through sysfs entries).
Reimplemented .hub_status_data and .hub_control functions,
implemented .disconnect and .reconnect ones.

Change-Id: If697c06a4ef39ccaabb7c96dbcc0c597e7780515
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>