Updating CreateShortcut activity to use the new ShortcutManager APIs

for creating shortcuts

Test:  adb shell am instrument -e class com.android.settings.CreateShortcutTest \
 -w com.android.settings.tests/android.support.test.runner.AndroidJUnitRunner

Change-Id: I09fb73ae2a0687a3269f3714bdb2c5d92c99ea87