Revert "UMS [1/6]: LegacyUSB Squashed commit with updates for 4.2"

This reverts commit 7fecc0f35ca6d39d533b966af0440ce323e0ff23.

Conflicts:
	services/java/com/android/server/usb/LegacyUsbDeviceManager.java
Revert "UMS [2/6]: Add option for switching between UMS and MTP/PTP mode."

This reverts commit 63ed2448f19b9bc7e18bca60466908b21002cb15.

Conflicts:
	services/java/com/android/server/usb/UsbDeviceManager.java
Revert "UMS [3/6]: Add UsbDebuggingManager and UsbDebuggingActivity to LegacyUsbManager"

This reverts commit a08b3557d4cadf77200c5388de3b032ab0174243.
Revert "UMS [4/6]: Allow USB notification to show when primary SD allows UMS and MTP"

This reverts commit 86708a0616f95daa373d92b8ab23ca0929c09c34.

Conflicts:
	services/java/com/android/server/usb/UsbDeviceManager.java
Revert "UMS [5/6]: Allow mounting of multiple volumes via mass storage (framework part)"

This reverts commit 3e3ddbeffa98fb844fa92f064af0852d9e1ed7da.
Revert "UMS [6]: Make "SD Card removed" notification dismissible if the removed SD Card is not the primary storage"

This reverts commit 05584b8a24dabf2ef853333b2f81fd8246037d03.