Update iconloaderlib min_sdk_version to 26. am: e543049272 am: fdfdc3a048

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/15602014

Change-Id: If3004a0dfb92b790fa4c6e467ba262f8e5a5efed
tree: 5b4c37764e65ff784b2c0a7f4dbef3f46635eaef
  1. iconloaderlib/
  2. searchuilib/