AOSP/Gallery2 - Updated to sdkVersion 29.

BUG: 133177396

Test: manual - Ran the following commands and tested the gallery2 UI on Pixel phone.

$ make -j 40
$ make Gallery2 -j

$ ls -l out/target/product/marlin/system/product/app/Gallery2/Gallery2.apk
  -rw-r--r-- 1 rtenneti primarygroup 5208417 Oct 14 14:42 out/target/product/marlin/system/product/app/Gallery2/Gallery2.apk

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

Change-Id: I90f703ff84831dfd382e152273e770adf4f60c83