remove xran_fh_tx_send_slot_BySymbol() and xran_fh_rx_read_slot_BySymbol()

We have separate functions ran_fh_tx_send_slot_BySymbol() and xran_fh_rx_read_slot_BySymbol() for liteon. This MR is to remove those separate functions. 

Main author: Teodora Vladic Co-author: Mario Joa-Ng

Changes:

xran_fh_tx_send_slot() is using if then else to handle per slot and per symbol logic. xran_fh_rx_read_slot() is straightforward.

Testing:

1. Liteon: Verified end-to-end.
2. Benetel: (per slot without beam_id): Verified end-to-end.
3. Microamp: (per slot with beam_id): Verified end-to-end. The branch microamp_F_harmonize is used instead as microamp could not be run with develop branch.