usb: Address some API review comments

- Add the missing annotation for the permission in UsbService
- Enforce the permission in UsbManager

Test: atest CtsUsbManagerTestCases
Bug: 179389205
Change-Id: I9cb3a0f24367f0b28417588e03db882db159f7a7

core/api/module-lib-current.txt

@@ -90,7 +90,7 @@ package android.hardware.usb {
 
   public class UsbManager {
     method @RequiresPermission(android.Manifest.permission.MANAGE_USB) public int getGadgetHalVersion();
-    method public int getUsbBandwidth();
+    method @RequiresPermission(android.Manifest.permission.MANAGE_USB) public int getUsbBandwidthMbps();
     method @RequiresPermission(android.Manifest.permission.MANAGE_USB) public int getUsbHalVersion();
     field public static final int GADGET_HAL_NOT_SUPPORTED = -1; // 0xffffffff
     field public static final int GADGET_HAL_V1_0 = 10; // 0xa

core/java/android/hardware/usb/UsbManager.java

@@ -1093,7 +1093,8 @@ public class UsbManager {
      * {@hide}
      */
     @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
-    public int getUsbBandwidth() {
+    @RequiresPermission(Manifest.permission.MANAGE_USB)
+    public int getUsbBandwidthMbps() {
         int usbSpeed;
 
         try {

services/usb/java/com/android/server/usb/UsbService.java

@@ -639,6 +639,7 @@ public class UsbService extends IUsbManager.Stub {
 
     @Override
     public int getCurrentUsbSpeed() {
+        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
         Preconditions.checkNotNull(mDeviceManager, "DeviceManager must not be null");
 
         final long ident = Binder.clearCallingIdentity();