Use Icon.createWithAdaptiveBitmap on >= O

Add padding around the bitmaps so the icons still look right.

Test: Manually verified shortcuts created on:
L, M, N, and O all look correct
O was tested on a Pixel.

Bug: 36405262
Change-Id: Ie14209357b91a866225a315d1c3355bc228c8dff
2 files changed