Add MPH and TCH primitives to layer 1 SAP

In order to control layer 1 via primitives, MPH primitives are required.
There is only one (MPH-INFO) primitive defined in TS 04.04 for all control
and measurement functions. A type identifier inside this primitive is used
to differentiate between different functions.

The TCH primitives are used to carry traffic. TCH primitives carry voice
or data traffic, whereas PH-DATA primitives carry FACCH data.

PH_RTS and TCH_RTS (ready-to-send) primitives are used to poll requests
from upper layers.
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