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>
        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: