sysmobts: Specify TRX nominal maximum tx power as fMaxTxPower
sysmobts: Specify TRX nominal maximum tx power as fMaxTxPower

In the MPH ACTIVATE-RF.req, we need to specify the nominal maximum
transmit power, i.e. >= what we later request during MPH-INIT.req.

This field was first introduced in API version 2.2, but we never used
it so far.  It may help fixing a bug related to excessive power
consumption of the sysmoBTS 2050.

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