kernel: deprecate k_uptime_delta_32

The documentation motivates this function by saying it is more
efficient than the core 64-bit version.  This was untrue when
originally added, and is untrue now.  Mark the function deprecated and
replace its sole in-tree use with the trivial equivalent.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
3 files changed