osmo-bts-trx-calypso.cfg: Adjust settings to work with current osmo-bts versions
osmo-bts-trx-calypso.cfg: Adjust settings to work with current osmo-bts versions

* Remove deprecated configuration options:
  'osmotrx timing-advance-loop' is deprecated, Timing Advance loop is now active by default
  'osmotrx ms-power-loop <-127-127>' is deprecated, MS Power Control is now managed by BSC
* Adjust 'ipa unit-id' (1801 -> 6969) to match the one from the example osmo-bsc.cfg
* Set clock advance values to known working values:
  + 'osmotrx fn-advance' -> 20
  + 'osmotrx rts-advance' -> 5
* Set 'nominal-tx-power' since the calypso-bts tranceiver does not support NOMTXPOWER

Change-Id: I69436b914cf1bec57f9fe7acea4a896e7c46b3a9

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