Merge "Add two extra empty pages on two panel launcher home" into sc-v2-dev am: 4926bf706a am: e19b1fb4a2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15727162

Change-Id: I7b7d7f9110dff58ea54d5bce7ae1f28e5ba91e82