We already use "OSMO_DYN" as C name for "fully dynamic" timeslot config,
when working with osmo-bsc.cfg I dearly miss this short name, it is a
pain / has become ridiculous to write 'tch/f_tch/h_sdcch8_pdch'.
Introduce 'dynamic/osmocom' and 'dynamic/ipaccess' as default names for
our dynamic timeslots on VTY and CTRL. The old 'tch/f_tch/h_sdcch8_pdch'
and 'tch/f_pdch' are still supported.
Change-Id: I37719edd867c777d1ce944b8e2f1efffac38f00e