Added missing USB_DEVICE_ATTACHED broadcast to running Activity

If an Activity programatically adds an ACTION_USB_DEVICE_ATTACHED intent,
it will never be delivered when the device is attached.  This change adds
the missing intent broadcast to running Activities.

File changes:
	modified:   services/java/com/android/server/usb/UsbSettingsManager.java

Change-Id: I767ee4d0765a7901c36e4c6f4aaf6583da2ac6f4
Signed-off-by: Robin Cutshaw <robin.cutshaw@gmail.com>