4.18 brought cpufreq support for H3, but sunxi_defconfig does not enable the
ondemand cpufreq govenor so the frequency is dynamically adjusted - So
enable it in linux-extra.config.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>