[Android][telemetry] Update pylib imports for modules that moved into devil.

tools/telemetry/telemetry/internal/platform/android_platform_backend.py

Index: tools/telemetry/telemetry/internal/platform/android_platform_backend.py
diff --git a/tools/telemetry/telemetry/internal/platform/android_platform_backend.py b/tools/telemetry/telemetry/internal/platform/android_platform_backend.py
index 124d9b969bdad55c1fdccd82892fbfb03f5ccf25..b40b54f6c57ed1bd71f4c305f94ec084d7927ac8 100644
--- a/tools/telemetry/telemetry/internal/platform/android_platform_backend.py
+++ b/tools/telemetry/telemetry/internal/platform/android_platform_backend.py
@@ -35,13 +35,12 @@ import adb_install_cert
 import certutils
 import platformsettings
 
+from devil.android import battery_utils
+from devil.android import device_errors
+from devil.android import device_utils
 from devil.android.sdk import version_codes
-
 from pylib import constants
 from pylib import screenshot
-from pylib.device import battery_utils
-from pylib.device import device_errors
-from pylib.device import device_utils
 from pylib.perf import cache_control
 from pylib.perf import perf_control
 from pylib.perf import thermal_throttle
@@ -453,7 +452,7 @@ class AndroidPlatformBackend(
   def PathExists(self, device_path, timeout=None, retries=None):
     """ Return whether the given path exists on the device.
     This method is the same as
-    android.pylib.device.device_utils.DeviceUtils.PathExists.
+    devil.android.device_utils.DeviceUtils.PathExists.
     """
     return self._device.PathExists(
         device_path, timeout=timeout, retries=retries)