Android: Make device info caching hack a bit less intrusive

The list of earlier build steps is not used anywhere else,
so it's not a really useful generic feature to have.

Avoid its single use here by searching for the interesting
step directly.

Change-Id: I52fffc75008dc01ff8ec6ca16045cbf151087ec1
Reviewed-by: Vikas Pachdha <vikas.pachdha@qt.io>

src/plugins/android/androiddeployqtstep.h

@@ -77,9 +77,6 @@ public:
     QVariantMap toMap() const override;
 
     UninstallType uninstallPreviousPackage();
-
-    AndroidDeviceInfo deviceInfo() const;
-
     void setUninstallPreviousPackage(bool uninstall);
 
 signals: