[MIPS] Fix and cleanup the mess that a dozen prom_printf variants are.

early_printk is a so much saner thing.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/arc/init.c b/arch/mips/arc/init.c
index 76ab505..0ac8f42 100644
--- a/arch/mips/arc/init.c
+++ b/arch/mips/arc/init.c
@@ -24,12 +24,15 @@
 {
 	PSYSTEM_PARAMETER_BLOCK pb = PROMBLOCK;
 	romvec = ROMVECTOR;
+	ULONG cnt;
+	CHAR c;
+
 	prom_argc = fw_arg0;
 	_prom_argv = (LONG *) fw_arg1;
 	_prom_envp = (LONG *) fw_arg2;
 
 	if (pb->magic != 0x53435241) {
-		prom_printf("Aieee, bad prom vector magic %08lx\n", pb->magic);
+		printk(KERN_CRIT "Aieee, bad prom vector magic %08lx\n", pb->magic);
 		while(1)
 			;
 	}
@@ -41,8 +44,8 @@
 	prom_meminit();
 
 #ifdef DEBUG_PROM_INIT
-	prom_printf("Press a key to reboot\n");
-	prom_getchar();
+	pr_info("Press a key to reboot\n");
+	ArcRead(0, &c, 1, &cnt);
 	ArcEnterInteractiveMode();
 #endif
 }