Some toolchains may define CLOCK_REALTIME and
CLOCK_MONOTONIC in their libc headers
with values that differ from Zephyr's internal
SYS_CLOCK_REALTIME and SYS_CLOCK_MONOTONIC.
To ensure consistent behavior across all boards and
toolchains, Introduce a helper function to map
CLOCK_REALTIME and CLOCK_MONOTONIC to Zephyr's internal
clock IDs (SYS_CLOCK_REALTIME and SYS_CLOCK_MONOTONIC).
This prevents mismatched clock IDs being passed to
the kernel, avoiding invalid clockid errors when using
functions like clock_gettime().
Signed-off-by: Mohamed Moawad <moawad@synopsys.com>
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