llc: Constify struct llc_conn_state_trans

'struct llc_conn_state_trans' are not modified in this driver.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  13923	  10896	     32	  24851	   6113	net/llc/llc_c_st.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  21859	   3328	      0	  25187	   6263	net/llc/llc_c_st.o

Signed-off-by: Christophe JAILLET <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/87cda89e4c9414e71d1a54bb1eb491b0e7f70375.1720973029.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <[email protected]>

Author: tititiou36

include/net/llc_c_st.h

@@ -44,8 +44,8 @@ struct llc_conn_state_trans {
 };
 
 struct llc_conn_state {
-	u8			    current_state;
-	struct llc_conn_state_trans **transitions;
+	u8				  current_state;
+	const struct llc_conn_state_trans **transitions;
 };
 
 extern struct llc_conn_state llc_conn_state_table[];