ARM: imx_v6_v7_defconfig: Enable CONFIG_ARM_IMX_CPUFREQ_DT

This is used for imx7d speed grading.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -57,6 +57,7 @@ CONFIG_CPU_FREQ_GOV_USERSPACE=y
 CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
 CONFIG_CPUFREQ_DT=y
 CONFIG_ARM_IMX6Q_CPUFREQ=y
+CONFIG_ARM_IMX_CPUFREQ_DT=y
 CONFIG_CPU_IDLE=y
 CONFIG_ARM_CPUIDLE=y
 CONFIG_VFP=y