core: kernel: add timeout_elapsed_us()

Add API function timeout_elapsed_us() to measure to time since or until
an initialized timeout reference elapses.

This function relies on other timeout_*() AP

core: kernel: add timeout_elapsed_us()

Add API function timeout_elapsed_us() to measure to time since or until
an initialized timeout reference elapses.

This function relies on other timeout_*() API functions are therefore
depends on CFG_CORE_HAS_GENERIC_TIMER being enabled.

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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core: kernel: delay: sort-out architecture-independant code from arch dir

This commit moves core/arch/arm/kernel/delay.c to core/kernel/delay.c.
Keeps architecture-dependant code in
core/arch/$ARCH/

core: kernel: delay: sort-out architecture-independant code from arch dir

This commit moves core/arch/arm/kernel/delay.c to core/kernel/delay.c.
Keeps architecture-dependant code in
core/arch/$ARCH/include/kernel/delay_arch.h and moves generic functions
to core/include/kernel/delay.h

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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