arm64: Use pr_* instead of printk

This patch fixed the following checkpatch complaint as using pr_*
instead of printk.

WARNING: printk() should include KERN_ facility level
Signed-off-by: Jungseok Lee <jays.lee@samsung.com>
Reviewed-by: Sungjinn Chung <sungjinn.chung@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/traps.c

@@ -156,7 +156,7 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 		frame.pc = thread_saved_pc(tsk);
 	}
 
-	printk("Call trace:\n");
+	pr_emerg("Call trace:\n");
 	while (1) {
 		unsigned long where = frame.pc;
 		int ret;
@@ -331,17 +331,17 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
 
 void __pte_error(const char *file, int line, unsigned long val)
 {
-	printk("%s:%d: bad pte %016lx.\n", file, line, val);
+	pr_crit("%s:%d: bad pte %016lx.\n", file, line, val);
 }
 
 void __pmd_error(const char *file, int line, unsigned long val)
 {
-	printk("%s:%d: bad pmd %016lx.\n", file, line, val);
+	pr_crit("%s:%d: bad pmd %016lx.\n", file, line, val);
 }
 
 void __pgd_error(const char *file, int line, unsigned long val)
 {
-	printk("%s:%d: bad pgd %016lx.\n", file, line, val);
+	pr_crit("%s:%d: bad pgd %016lx.\n", file, line, val);
 }
 
 void __init trap_init(void)