Merge "Do not show buttons in screen pinning dialog on tablets" into sc-v2-dev...

Merge "Do not show buttons in screen pinning dialog on tablets" into sc-v2-dev am: 03ac8eea am: 0bc6757b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16429456

Change-Id: I2d67a2b4d372591394173b0069fbee30294e307a