Update options.h: remove duplicated or already accepted switches

#define ERI_FDCNGVQ_LOW_ROM                             /* Eri: Contribution #31 Table ROM saving for IVAS FDCNG-VQ modes       */

#define FIX_401_DIRAC_RENDERER_META_READ_INDICES        /* Nokia: Issue 401: Fix metadata reading indices in DirAC renderer. */

#define FIX_406_IVAS_POSITION                           /* Eri: Issue 406: Unify IVAS_POSITION to use IVAS_VECTOR3 instead */

#define REND_DEBUGGING_REVISION                         /* VA: encapsulate rendering debugging options with DEBUGGING */

#define FIX_416_ISM_BR_SWITCHING                        /* FhG: add missing CLDFB reconfig to ISM BR switching */

#define FIX_SP2A                                        /* VA: Issue 412: Adjust threshold for the S_p2a feature in the tonal detector */