Update android apps to latest android plugin

NDK depricated mips toolchain, which is causing a build error,
because old android gradle plugin is looking for it.
Updating to latest plugin is fixing the build issue.

Test: Built skottie demo app from command line and Android Studio
Bug: skia:
Change-Id: I0071bf996c44f96969079cb680cb05ec38efdc93
Reviewed-on: https://skia-review.googlesource.com/c/159581
Reviewed-by: Heather Miller <hcm@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Stan Iliev <stani@google.com>
4 files changed