Add null check on UsbManager

Fix NPE from DevicePolicyManagerService since UsbService is not
available in ARC.

Bug: 180428336
Test: run DeviceBootTest
Change-Id: I23dce0c0bc1890477d2f31e43a3d54c01c0ef725

services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyManagerService.java

@@ -16701,6 +16701,8 @@ public class DevicePolicyManagerService extends BaseIDevicePolicyManager {
     @Override
     public boolean canUsbDataSignalingBeDisabled() {
         return mInjector.binderWithCleanCallingIdentity(() ->
-                mInjector.getUsbManager().getUsbHalVersion() >= UsbManager.USB_HAL_V1_3);
+                mInjector.getUsbManager() != null
+                        && mInjector.getUsbManager().getUsbHalVersion() >= UsbManager.USB_HAL_V1_3
+        );
     }
 }