[non-BE] Resolve #2009: "MASA 1TC, 64 kbps, DTX on: High noise-floor for FX Dec, 8 - 16 kHz"

Mohammadreza Naghibzadehrequested to merge
2009_fix_high_noise_floor_for_fx_dec into main

corrected Cldfb_RealBuffer_in_fx[2] , Cldfb_ImagBuffer_in_fx[2] scaling

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