The Google OnHub doesn't init the SMEM in SBL causing the CPUFreq driver
to fail probe. This is caused by the fact that new CPUFreq driver makes
use of SMEM to identify the SoC variant and on Google OnHub this is not
available.
Backport patch to detect this state and fallback to compatible
matching fixing the CPUFreq driver.
Link: https://github.com/openwrt/openwrt/pull/20587
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>