timing: add kconfig CONFIG_TIMING_FUNCTIONS_NEED_AT_BOOT

This adds a new kconfig CONFIG_TIMING_FUNCTIONS_NEED_AT_BOOT so
that the timing subsystem can be initialized at boot, instead of
being #ifdef under thread runtime statistics. This will allow
other part of kernel and other subsystems to utilize the timing
functions.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
3 files changed