Add back @NonNull to DevicePolicyManager.wipeData

- Added WIPE_SILENTLY to skip notifying user

Bug: 114711242
Test: cts-tradefed run singleCommand cts -m CtsDevicePolicyManagerTestCases --test com.android.cts.devicepolicy.ManagedProfileTest#testWipeDataWithoutReason
Change-Id: I163e0f3e1ab1e6feef668070a73b1f86db9691b3