Bit exact optimizations in SBA decoder renderer path

Changes are enabled with macro OPT_SBA_REND_V1_BE
Functions and corresponding WMOPs gains:
ivas_dirac_dec_output_synthesis_process_subframe_psd_ls_fx 1.5
vbap_gains                                                 0.2
vector_matrix_multiply_3x3_fx                              2.2
protoSignalComputation4_fx                                 1.8
in_tri_fx                                                  0.1

Test case:
./IVAS_cod -sba 1 256000 48 scripts/testv/stvFOA48c.wav bit_sba
./IVAS_dec 7_1 48 bit_sba sba.wav