disable axp20x for now, it seems after a while we get "send STOP failed" from i2c bus and then things go from bad to worse
A20 is a Cortex-A7, so set CPUFLAGS to match
A20 is a Cortex-A7, so set CPUFLAGS to match; disbale ALLWINNER_A10 and CPU_CORTEXA8 options