bts-trx: Change super verbose IDLE ind not-supported line to DEBUG
bts-trx: Change super verbose IDLE ind not-supported line to DEBUG

It's impossible to see other logging otherwise.

Change-Id: I64ee83b734ecff593ff2a1cf97b192db93228e22

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