nokia_site: Add new BTS types to the list
This commit adds Flexi EDGE, Flexi Multiradio and Flexi Multiradio 10
BTS types to the supported device list.
Keep in mind that this was not yet tested as we lack actual HW,
but the OML logic should be the same.
Change-Id: Ie3f1a3c3d7d72a49401d66625516f92cc7384949
