JBM MC bitrate switching broken

Basic info

Bug description

When switching from another MC mode to ParamUpmix in VoIP/Variable Speed Decoding, the ParamUpmix interpolator is not initialized and the TC handle buffer is not reconfigured properly.

Ways to reproduce

Run:

.\IVAS_cod.exe -mc 7_1_4 .\scripts\switchPaths\sw_mctech_5fr.bin 48 .\scripts\testv\stv714MC48c.wav bit
.\scripts\tools\Win32\networkSimulator_g192.exe .\scripts\dly_error_profiles\dly_error_profile_0.dat bit bit_nws bit_trace 1 0
.\IVAS_dec.exe -voip HOA3 48 bit_nws dec.wav