Changed dpm shell commands to use 'cmd device_policy'

Added the missing commands to DevicePolicyManagerServiceShellCommand and
changed 'adb shell dpm' to call 'adb shell cmd device_policy'

Fixes: 173381875
Test: atest com.android.bedstead.nene.devicepolicy.DevicePolicyTest
Test: atest com.android.bedstead.nene.devicepolicy.ProfileOwnerTest
Test: atest com.android.bedstead.nene.devicepolicy.DeviceOwnerTest
Test: manually tested the migrated commands
Change-Id: Id86382f11cf8197230ef62c33961e01b0b541358
diff --git a/cmds/dpm/Android.bp b/cmds/dpm/Android.bp
index 665abcd..6819d09 100644
--- a/cmds/dpm/Android.bp
+++ b/cmds/dpm/Android.bp
@@ -18,8 +18,7 @@
     ],
 }
 
-java_binary {
+sh_binary {
     name: "dpm",
-    wrapper: "dpm",
-    srcs: ["**/*.java"],
+    src: "dpm",
 }