Android: Downgrade gradle plugin to 3.5.3
With the NDK installed locally, gradle plugin 3.6.0 seems to enforce
a specific older NDK version, and will fail building if you don't have
it installed with:
```
No version of NDK matched the requested version 20.0.5594570.
Versions available locally: 21.0.6113669
```
Upstream issue: https://github.com/gradle/gradle/issues/12440
(cherry picked from commit ba2ec53a262766dd2309aea0564de3dc47c9d9a2)