ARM: imx_v6_v7_defconfig: select the CONFIG_CPUFREQ_DT

Select CONFIG_CPUFREQ_DT by default to enable
cpu-freq driver for i.MX7D.
Signed-off-by: NAnson Huang <Anson.Huang@nxp.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -60,6 +60,7 @@ CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
 CONFIG_CPU_FREQ_GOV_POWERSAVE=y
 CONFIG_CPU_FREQ_GOV_USERSPACE=y
 CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
+CONFIG_CPUFREQ_DT=y
 CONFIG_ARM_IMX6Q_CPUFREQ=y
 CONFIG_CPU_IDLE=y
 CONFIG_VFP=y