bts-trx: Mark 'osmotrx power' VTY cmd as deprecated
bts-trx: Mark 'osmotrx power' VTY cmd as deprecated

There's a standarized way through OML's Administrate State to control
the status of TRX, so let's use and maintain that one rather than this
ad-hoc hack.

Related: SYS#4920
Change-Id: Ia7f190063c35e0ed8e2e734047b3aff608cd3ce3

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts