NR-UE: Merging different UE NR SLOT FEP procedures into one.
Changes: Removed sl_nr_slot_fep, Used nr_slot_fep also for sidelink. Removed nr_slot_fep_init_sync and used nr_slot_fep in UE
Merged sl_nr_slot_fep, nr_slot_fep_init_sync into nr_slot_fep , thereby removing unnecessary duplication of code.
Edited by Raghavendra Dinavahi