improve handling of ssb_perRACH_OccasionAndCB_PreamblesPerSSB according to need code

(also removing unused FAPI element ssb_per_rach)

nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h

@@ -697,7 +697,6 @@ typedef struct
   uint8_t restricted_set_config;//PRACH restricted set config Value: 0: unrestricted 1: restricted set type A 2: restricted set type B
   uint8_t num_prach_fd_occasions;//Corresponds to the parameter 𝑀 in [38.211, sec 6.3.3.2] which equals the higher layer parameter msg1FDM Value: 1,2,4,8
   fapi_nr_num_prach_fd_occasions_t* num_prach_fd_occasions_list;
-  uint8_t ssb_per_rach;//SSB-per-RACH-occasion Value: 0: 1/8 1:1/4, 2:1/2 3:1 4:2 5:4, 6:8 7:16
   uint8_t prach_multiple_carriers_in_a_band;//0 = disabled 1 = enabled
   uint8_t root_seq_computed; // flag set and used only in PHY to indicate if table is computed with this config