Update NDK prebuilts to build 6401870.

Taken from branch aosp-simpleperf-release.

Also update ChangeLog.

Bug: 155507210
Test: run test.py for different Android versions on
Test: linux/darwin/windows.
Test: run ndk/checkbuild.py.
Change-Id: I594b08900880b02854169faff116744ae30f5615
33 files changed