arm: set cntfrq_el0 if CONFIG_COUNTER_FREQUENCY is valid

Since COUNTER_FREQUENCY is obselete, so set cntfrq_el0 if
CONFIG_COUNTER_FREQUENCY is valid

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index 6a6a4f8..d328e8c 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -138,9 +138,9 @@
 0:
 	msr	daifclr, #0x4			/* Unmask SError interrupts */
 
-#ifdef COUNTER_FREQUENCY
+#if CONFIG_COUNTER_FREQUENCY
 	branch_if_not_highest_el x0, 4f
-	ldr	x0, =COUNTER_FREQUENCY
+	ldr	x0, =CONFIG_COUNTER_FREQUENCY
 	msr	cntfrq_el0, x0			/* Initialize CNTFRQ */
 #endif