ARM: multi_v7_defconfig: Enable ARM_IMX6Q_CPUFREQ

The Wandboard Quad can make use of the cpufreq support provided by the
driver. Enable it and its dependency, REGULATOR_ANATOP, by default.

Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>