MIPS: MT: Remove unused MT single-threaded cache flush code

Commit ac41f9c4 ("MIPS: Remove a temporary hack for debugging cache
flushes in SMTC configuration") removed an ugly hack that allowed cache
flushing to be performed single-threaded, something which should not be
necessary outside of debug sessions performed long ago.

Whilst the hack was removed from the cache flush code itself, the
mt_protdflush & mt_protiflush variables were left behind along with code
providing the protdflush & protiflush command line arguments. The
mt_cflush_lockdown() & mt_cflush_release() functions were also left
behind but are now entirely unused.

Remove all the unused code to complete the removal of the MT ASE
single-threaded cache flush hack.
Signed-off-by: Paul Burton <paul.burton@mips.com>

arch/mips/kernel/mips-mt.c

@@ -155,25 +155,9 @@ static int __init config7_set(char *str)
 __setup("config7=", config7_set);
 
 /* Experimental cache flush control parameters that should go away some day */
-int mt_protiflush;
-int mt_protdflush;
 int mt_n_iflushes = 1;
 int mt_n_dflushes = 1;
 
-static int __init set_protiflush(char *s)
-{
-	mt_protiflush = 1;
-	return 1;
-}
-__setup("protiflush", set_protiflush);
-
-static int __init set_protdflush(char *s)
-{
-	mt_protdflush = 1;
-	return 1;
-}
-__setup("protdflush", set_protdflush);
-
 static int __init niflush(char *s)
 {
 	get_option(&s, &mt_n_iflushes);
@@ -233,10 +217,6 @@ void mips_mt_set_cpuoptions(void)
 	}
 
 	/* Report Cache management debug options */
-	if (mt_protiflush)
-		printk("I-cache flushes single-threaded\n");
-	if (mt_protdflush)
-		printk("D-cache flushes single-threaded\n");
 	if (mt_n_iflushes != 1)
 		printk("I-Cache Flushes Repeated %d times\n", mt_n_iflushes);
 	if (mt_n_dflushes != 1)