rtw89: rtw89_ser: add const to struct state_ent and event_ent

Change the struct and the uses to const to reduce data.

$ size drivers/net/wireless/realtek/rtw89/ser.o* (x86-64 defconfig w/ rtw89)
   text	   data	    bss	    dec	    hex	filename
   3741	      8	      0	   3749	    ea5	drivers/net/wireless/realtek/rtw89/ser.o.new
   3437	    312	      0	   3749	    ea5	drivers/net/wireless/realtek/rtw89/ser.o.old
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/2fd88e6119f62b968477ef9781abb1832d399fd6.camel@perches.com

drivers/net/wireless/realtek/rtw89/core.h

@@ -2948,8 +2948,8 @@ struct rtw89_ser {
 
 	struct work_struct ser_hdl_work;
 	struct delayed_work ser_alarm_work;
-	struct state_ent *st_tbl;
-	struct event_ent *ev_tbl;
+	const struct state_ent *st_tbl;
+	const struct event_ent *ev_tbl;
 	struct list_head msg_q;
 	spinlock_t msg_q_lock; /* lock when read/write ser msg */
 	DECLARE_BITMAP(flags, RTW89_NUM_OF_SER_FLAGS);

drivers/net/wireless/realtek/rtw89/ser.c

@@ -632,7 +632,7 @@ static void ser_l2_reset_st_hdl(struct rtw89_ser *ser, u8 evt)
 	}
 }
 
-static struct event_ent ser_ev_tbl[] = {
+static const struct event_ent ser_ev_tbl[] = {
 	{SER_EV_NONE, "SER_EV_NONE"},
 	{SER_EV_STATE_IN, "SER_EV_STATE_IN"},
 	{SER_EV_STATE_OUT, "SER_EV_STATE_OUT"},
@@ -648,7 +648,7 @@ static struct event_ent ser_ev_tbl[] = {
 	{SER_EV_MAXX, "SER_EV_MAX"}
 };
 
-static struct state_ent ser_st_tbl[] = {
+static const struct state_ent ser_st_tbl[] = {
 	{SER_IDLE_ST, "SER_IDLE_ST", ser_idle_st_hdl},
 	{SER_RESET_TRX_ST, "SER_RESET_TRX_ST", ser_reset_trx_st_hdl},
 	{SER_DO_HCI_ST, "SER_DO_HCI_ST", ser_do_hci_st_hdl},