core: kernel: mutex compliant with PM sequences

Add mutex_pm_aware_*() functions for mutex used on resources accessed
at runtime using a conventional mutex and also during low power
sequences that e

core: kernel: mutex compliant with PM sequences

Add mutex_pm_aware_*() functions for mutex used on resources accessed
at runtime using a conventional mutex and also during low power
sequences that execute in a non-thread context.

This change defines MUTEX_PM_AWARE_INITIALIZER macro from a new
header file (mutex_pm_aware.h) instead of existing mutex.h to prevent
a circular dependency between spinlock.h (requires thread.h), thread.h
(indirectly includes mutex.h) and mutex.h (that would depend on
spinlock.h for definition of the SPINLOCK_UNLOCK macro ).

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

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