r262585, r262587, r262696, r262712
Replace many pasted identical definitions of cpu_initclocks() with a common
implementation in arm/machdep.c.
aicasm: Don't complain about missing prototypes to ease bootstrap issues.
Vybrid: Add driver for Inter-Integrated Circuit (I2C).
imx6: Initialize the Low Power Mode bits to keep the ARM cores running
during WFI.
All our current ARM multi-core systems have all cores in one package with
a shared L2 cache, reflect that in the common cpu_topo() routine.
mpcore timer: Supply a DELAY() implementation via weak linkage, so that
SoC-specific code can supply a better implementation.
imx6: Add some rudimentary voltage control.
Add an armv7 implementation of cpu_sleep().
Add __used attribute so that the DELAY implementation doesn't get
optimized away as unreferenced, causing linker errors when trying to
resolve the weak reference to the missing function.
979d093228