Do not call time APIs introduced in R if device is pre-R

* If the device is pre-R, do not call setAutoTimeEnabled
  and setAutoTimeZoneEnabled.
* Call setGlobalSettings instead.

Manual testing steps
* Install TestDPC
* Set device in device owner mode
* Select setTime and setTimeZone
* Verify TestDPC does not crash

Bug: 165592867
Test: manual testing with TestDPC
Change-Id: Ife22d85f0415b978b34c89e5950242df5815e8e5

Author: Alex Johnston

app/src/main/java/com/afwsamples/testdpc/policy/PolicyManagementFragment.java

@@ -1229,11 +1229,21 @@ public void onPositiveButtonClicked(String[] lockTaskArray) {
                 return true;
             case SET_TIME_KEY:
                 // Disable auto time before we could set time manually.
-                setAutoTimeEnabled(false);
+                if (Util.SDK_INT >= VERSION_CODES.R) {
+                    setAutoTimeEnabled(false);
+                } else {
+                    mDevicePolicyManager.setGlobalSetting(mAdminComponentName,
+                            Settings.Global.AUTO_TIME, "0");
+                }
                 showSetTimeDialog();
                 return true;
             case SET_TIME_ZONE_KEY:
-                setAutoTimeZoneEnabled(false);
+                if (Util.SDK_INT >= VERSION_CODES.R) {
+                    setAutoTimeZoneEnabled(false);
+                } else {
+                    mDevicePolicyManager.setGlobalSetting(mAdminComponentName,
+                            Settings.Global.AUTO_TIME_ZONE, "0");
+                }
                 showSetTimeZoneDialog();
                 return true;
             case MANAGE_OVERRIDE_APN_KEY: