Changed Planets example to use the BufferedGeometry that
is more optimal as it keeps all data in the GPU. This increased
performance on iPad Air 5%

Change-Id: I38d01065f5d34ec74df3217d4baccec474c6bb32
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>