arch: arm: cortex_m: conditionally select ARCH_HAS_TIMING_FUNCTIONS
Cortex-M SoCs implement (optionally) the Data Watchpoint and
Tracing Unit (DWT), which can be used for timing functions.
Select the corresponding ARCH capability if the SoC implements
the DWT.
Signed-off-by:
Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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