DeviceAdminService must be protected with BIND_DEVICE_ADMIN.

Bug: 37625902
Bug: 36226832

Test: cts-tradefed run cts-dev --skip-device-info --skip-preconditions --skip-system-status-check com.android.compatibility.common.tradefed.targetprep.NetworkConnectivityChecker -a armeabi-v7a -l DEBUG -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy.DeviceAdminServiceDeviceOwnerTest
Test: cts-tradefed run cts-dev --skip-device-info --skip-preconditions --skip-system-status-check com.android.compatibility.common.tradefed.targetprep.NetworkConnectivityChecker -a armeabi-v7a -l DEBUG -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy.DeviceAdminServiceProfileOwnerTest
Change-Id: I0bee75d758b565c6587d0e9cabf63bec351a0669