Revert "Update ft1248x1_sm.pio : with data byte in RP-RXfifo[7:0]"

This reverts commit 94d44b4b

nanosoc_board/soclabs_pio/ft1248x1/ft1248x1_sm.pio

@@ -90,8 +90,6 @@ ft_data_loop:
     jmp y--, ft_data_loop
 ft_done:
     jmp x--, ft_xfer_end // if X was non-zero than was FT-read, so all done
-// shift RXD from ISR[31:24] to ISR[7:0]
-    in null, 24
 // if FT write now manually push the ISR contents to RP RXFIFO
     push noblock // not auto-push
 ft_xfer_end: