core: include: cache_helpers.h: allow reusing architecture-dependent code

To allow reuse of architecture-dependent code, divide original
cache_helpers.h into two separate header files
core/$arch/inc

core: include: cache_helpers.h: allow reusing architecture-dependent code

To allow reuse of architecture-dependent code, divide original
cache_helpers.h into two separate header files
core/$arch/include/kernel/cache_helpers_arch.h and
core/include/kernel/cache_helpers.h

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
[jf: set author to be same as Signed-off-by:]
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

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