vty: print version and description for each phy
vty: print version and description for each phy

When printing BTS via 'show bts ..' let's also print each TRX, which phy
number and version it uses and its description. It's helpful in
troubleshooting low-level issues as it allows vendor-specific code to
easily expose firmware version.

Related: SYS#3884
Change-Id: Iabcc862566b40a9314f3e1d17fda61d8ab24a3cd

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