[android] Fix order in which repos are being synced

[andrlee]

While working on setting up android maps sdk with android studio (v.3.2) i ran on the gradle config problem producing the following:

Failed to resolve: support-v4
Open File
Failed to resolve: extensions
Open File
Failed to resolve: support-vector-drawable
Open File
Failed to resolve: livedata-core
Open File
Failed to resolve: runtime
Open File
Failed to resolve: common
Open File
Failed to resolve: viewmodel
Open File
Failed to resolve: monitor
Open File
Failed to resolve: extensions
Open File
Failed to resolve: support-vector-drawable
Open File
Failed to resolve: livedata-core
Open File
Failed to resolve: runtime
Open File
Failed to resolve: common
Show in File
Failed to resolve: viewmodel
Open File

I was able to resolve this problem by switching the order in which repositories are listed in build.gradle file. I'm not sure if anyone else ran on it before or if there's a better fix for this problem. I'll let @mapbox/maps-android team decide if this fix is useful or abandon this PR if it is not.

[LukasPaczos]

@andrlee I've run into the exact same issue yesterday in the plugins repo and proposed the exact same solution mapbox/mapbox-plugins-android#731 and it seems to be working reliably since then.