[non-BE] change internal sampling rate for 1ISM 48 kbps
1ISM 48 kbps - change ACELP/TCX 16 kHz core to TCX only 25.6 kHz core; under ISM_25k6_HZ_CORE
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Related to #540 (closed)
Affected operating points: 1ISM at 48 kbps, 2ISM at 96 kbps, 3ISM at 128 kbps, 4ISm at 192 kbps.
Edited by vaclav