build_rootfs.sh: Enable unlimited memlock on arm64 am: 2cea51a84c am: e480939856 am: 5f155748b6

Original change: https://android-review.googlesource.com/c/kernel/tests/+/2007650

Change-Id: I18fc4d96a417bf462415217f23e48366644f077e
tree: c8904a778c51837afe00678c9cf1499d6f2e47cf
  1. devicetree/
  2. net/
  3. Android.bp
  4. METADATA