edge: Add max_mcs_ul and max_mcs_dl config

This sets the maximum MCS encoding used for EGPRS RLC data blocks
in either direction.

The following VTY command are added to node config-pcu:

 - mcs max <1-9>         set maximum for both, uplink and downlink
 - mcs max <1-9> <1-9>   set maximum for downlink and uplink (in that
                         order)
 - no mcs max            do not limit

Note that using a value of 4 or below for each direction implies
that a GMSK-only TBF may be assumed, which for instance would allow
the use of the GPRS MS class instead of the possibly more restrictive
EGPRS MS class.

Sponsored-by: On-Waves ehf

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