Add defines for FN to SAMPLE conversion
Add defines for FN to SAMPLE conversion

Add defines necessary to correctly convert number of TDMA frames into
number of voice samples. Defines are proposed by Harald in comments on
gerrit.

Change-Id: I1d8345352fb2ac76f71e88cb40f089fe3f9aae7e
Related: OS#1562
Reviewed-on: https://gerrit.osmocom.org/200
Tested-by: Jenkins Builder
Reviewed-by: Harald Welte <57a0f16bf14496e20d21dd8c0873142ff0a2fbb4@gnumonks.org>

osmocom/libosmo-abis,osmocom/libosmo-abis,osmocom/libosmo-abis