[hw,spi_host,rtl] CSB is NumCS wide

This was mistakenly changed to CSW in the last PR. Revert it back.

Signed-off-by: Robert Schilling <[email protected]>

hw/ip/spi_host/rtl/spi_host_fsm.sv

@@ -19,7 +19,7 @@ module spi_host_fsm
   input                              command_valid_i,
   output logic                       command_ready_o,
   output logic                       sck_o,
-  output logic [CSW-1:0]             csb_o,
+  output logic [NumCS-1:0]           csb_o,
   output logic [3:0]                 sd_en_o,
   output logic                       last_read_o,
   output logic                       last_write_o,