Harmonize getTcxonly_ivas_fx(), getTcxonly(), getTcxonly_fx()

Bug description

In float, we currently have only one instance of getTcxOnly(), however, in BASOP, there are currently three different versions:

• getTcxonly_ivas_fx()
• getTcxonly()
• getTcxonly_fx()

Unless this is not possible, getTcxonly_fx() should be brought inline with the floating-point code, used throughout the BASOP code and the other instances should be removed.

This has to be a BE change.