imx: mx6ul: skip setting ahb rate

To i.MX6UL, default ARM rate and AHB rate is 396M and 198M,
no need to set them.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/mx6/soc.c

@@ -328,13 +328,18 @@ int arch_cpu_init(void)
 	 */
 	init_bandgap();
 
-	/*
-	 * When low freq boot is enabled, ROM will not set AHB
-	 * freq, so we need to ensure AHB freq is 132MHz in such
-	 * scenario.
-	 */
-	if (mxc_get_clock(MXC_ARM_CLK) == 396000000)
-		set_ahb_rate(132000000);
+	if (!IS_ENABLED(CONFIG_MX6UL)) {
+		/*
+		 * When low freq boot is enabled, ROM will not set AHB
+		 * freq, so we need to ensure AHB freq is 132MHz in such
+		 * scenario.
+		 *
+		 * To i.MX6UL, when power up, default ARM core and
+		 * AHB rate is 396M and 132M.
+		 */
+		if (mxc_get_clock(MXC_ARM_CLK) == 396000000)
+			set_ahb_rate(132000000);
+	}
 
 		/* Set perclk to source from OSC 24MHz */
 #if defined(CONFIG_MX6SL)