AOSP/Gallery2 - Updated to sdkVersion 29.

BUG: 133177396

Test: manual - Ran the following tests on Pixel phone. Tested the gallery2 UI.

$ make -j 40
$ make Gallery2 -j

$ ls -l out/target/product/bonito/product/app/Gallery2/Gallery2.apk
  ... Apr 23 14:50 out/target/product/bonito/product/app/Gallery2/Gallery2.apk

$ adb install -r -d -g out/target/product/marlin/system/product/app/Gallery2/Gallery2.apk

Change-Id: I67616e4127db84575515a173c28c3381e629f4cf