Merge "Set IconView drawable size for SplitPlaceholderView" into sc-v2-dev am: 9bd2802c9b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15780634

Change-Id: I3e8dde75f36840a401577ea3c19faee2329159f2