The previous function was wrong, as it was
configuring trigger iface and not trigger mux.

Added "_BASE" to name address, for consistency
with existing names.

This is very useful on setting/getting registers in
modules that have multiple channels with the same
register definitions.

This way avoids users needing to know how this
is implemented internally and, obviously, decreases
the chances of error.

We don't need to destroy zactor PIPE sockets,
as CZMQ zactor infrastructure already does this.

RFREQ is a 38-bit number, with the 10 MSB
the integer part and the 28 LSB the fractional
part. So, we need to divide RFEQ by 2^28 prior
to the calculation.

This was causing a segfault when reading the frequency

As libbpmclient changed, we need to update it there too.

In this way, we can standardize how the
functions are called and handled.

This fixes #115 github issue

Note that this requires at least
lnls-dig/bpm-gw@27a4af84b1