Increase available heap am: 75cafe4c7a

Original change: https://android-review.googlesource.com/c/trusty/app/secretkeeper/+/2926710

Change-Id: If287f84b27528ed690e90b798986abc0dfac1a7d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>