Summary:
According to Google, ANDROID_HOME is deprecated.
This means, that having only ANDROID_SDK_ROOT as environment variable leading to Android SDK is enough.
Flipper supports only ANDROID_HOME, so I would like to add ANDROID_SDK_ROOT support.
However, there is a set of rules of ANDROID_HOME and ANDROID_SDK_ROOT priority.
Everything is mentioned on a this page: https://developer.android.com/studio/command-line/variables
## Changelog
Added ANDROID_SDK_ROOT environment variable support
Pull Request resolved: https://github.com/facebook/flipper/pull/2106
Test Plan: Probably I would need a help with this
Reviewed By: mweststrate
Differential Revision: D27505024
Pulled By: passy
fbshipit-source-id: 8bdc66a9652c673fd44944d87af1efc9e93d0f1b
c9b6f6c7d9