Set the defalut value of SYS_CLOCK_HW_CYCLES_PER_SEC Kconfig option
from the Device Tree. The `clock-frequency` property of the DT cpu@0
node is a single source of truth defining the CPU frequency. This is
the value used e.g. by all Atmel drivers.
For Atmel SAM family CPU clock is currently the only supported system
clock source. Ensure that kernel understanding of the hardware clock
frequency is the correct one.
Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>
471d5ea474