net: dsa: sja1105: Use units.h instead of the copy of a definition

BYTES_PER_KBIT is defined in units.h, use that definition.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20231128175027.394754-1-andriy.shevchenko@linux.intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/sja1105/sja1105_main.c

@@ -21,6 +21,8 @@
 #include <linux/if_bridge.h>
 #include <linux/if_ether.h>
 #include <linux/dsa/8021q.h>
+#include <linux/units.h>
+
 #include "sja1105.h"
 #include "sja1105_tas.h"
 
@@ -2138,7 +2140,6 @@ static void sja1105_bridge_leave(struct dsa_switch *ds, int port,
 	sja1105_bridge_member(ds, port, bridge, false);
 }
 
-#define BYTES_PER_KBIT (1000LL / 8)
 /* Port 0 (the uC port) does not have CBS shapers */
 #define SJA1110_FIXED_CBS(port, prio) ((((port) - 1) * SJA1105_NUM_TC) + (prio))