Bump to xamarin/xamarin-android-tools/main@a698a33 (dotnet#1189)

Changes: dotnet/android-tools@ed102fc...a698a33

  * dotnet/android-tools@a698a33: Merge pull request dotnet/android-tools#227 from xamarin/dev/jestedfa/uses-sdk
  * dotnet/android-tools@8b13954: Added unit tests
  * dotnet/android-tools@84c2911: Only conditionally include <uses-sdk /> in the AndroidManifest.xml when saving

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