imx: mx6: correct get_cpu_speed_grade_hz for i.MX6DQP

Correct get_cpu_speed_grade_hz for i.MX6DQP, otherwise we
will get wrong speed grade info i.MX6DQP.

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

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

@@ -138,14 +138,14 @@ u32 get_cpu_speed_grade_hz(void)
 	switch (val) {
 	/* Valid for IMX6DQ */
 	case OCOTP_CFG3_SPEED_1P2GHZ:
-		if (is_mx6dq())
+		if (is_mx6dq() || is_mx6dqp())
 			return 1200000000;
 	/* Valid for IMX6SX/IMX6SDL/IMX6DQ */
 	case OCOTP_CFG3_SPEED_1GHZ:
 		return 996000000;
 	/* Valid for IMX6DQ */
 	case OCOTP_CFG3_SPEED_850MHZ:
-		if (is_mx6dq())
+		if (is_mx6dq() || is_mx6dqp())
 			return 852000000;
 	/* Valid for IMX6SX/IMX6SDL/IMX6DQ */
 	case OCOTP_CFG3_SPEED_800MHZ: