lib_rend/ivas_mcmasa_ana_fx.c: Remove floating-point leftovers

Bug description

In lib_rend/ivas_mcmasa_ana_fx.c, struct CovarianceMatrix there are two floating-point buffer leftovers:

typedef struct
{
    float xr[MCMASA_MAX_ANA_CHANS][MCMASA_MAX_ANA_CHANS];
    float xi[MCMASA_MAX_ANA_CHANS][MCMASA_MAX_ANA_CHANS];
    Word32 xr_fx[MCMASA_MAX_ANA_CHANS][MCMASA_MAX_ANA_CHANS];
    Word32 xi_fx[MCMASA_MAX_ANA_CHANS][MCMASA_MAX_ANA_CHANS];
    Word16 xr_e[MCMASA_MAX_ANA_CHANS][MCMASA_MAX_ANA_CHANS]; /*Stores exponent for xr_fx*/
    Word16 xi_e[MCMASA_MAX_ANA_CHANS][MCMASA_MAX_ANA_CHANS]; /*Stores exponent for xi_fx*/
} CovarianceMatrix;

I haven't seen any debugging code which makes use of it, so I would propose to remove it.