power_control: vty: re-use cfg_bts_ul_power_target()
power_control: vty: re-use cfg_bts_ul_power_target()

This reduces code duplication by defining an alias.

Change-Id: I37f51d426fcf008c9d9e933827de70ab7b072a94
Related: SYS#4918

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