ARM: sunxi_defconfig: Enable TOUCHSCREEN_SUN4I, CPUFREQ_DT, CPU_THERMAL

This patch enables TOUCHSCREEN_SUN4I, CPUFREQ_DT, and CPU_THERMAL to
enable cpufreq support with passive cpu cooling (thermal throttling)
by default.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>