BSC_Tests: fix AMR tests matching RSL MultiRate configuration IE

The RSL_IE_MultirateCfg was implemented and added to union RSL_IE_Body
in [1].  Before this change, this IE was decoded as RSL_LV (basically
an octetstring).  Now this IE is decoded as RSL_IE_MultirateCfg, while
some AMR tests still expect RSL_LV.  Let them use RSL_IE_MultirateCfg.

Change-Id: I40dab41d5dc5d14e358ba5a070ce174e7d8d4a4b
Fixes: [1] I0a5ddce570c0fd70f096d897b0b609d20b552ff7
1 file changed