fix CtsDevicePolicyManager for device of non-support voice

For the device which has SMS and data comm but does not
support the voice call,
this test shold be skipped becasuse this device does not
have default dialer app.

Bug: 160550961
Test: pass
      MixedProfileOwnerTest#testLockTask_defaultDialer
      MixedDeviceOwnerTest#testLockTask_defaultDialer

Change-Id: I9db32dd37b0d1876e3dbf0a3645a9145b73abf3c
(cherry picked from commit 161c128aeb0cf6457fe55e9bc7dd092778fd5879)
2 files changed