sys_clock: extra time defines

Add additional time defines to round out the `SEC_PER_*` family.
These are easier to type than `SEC_PER_MIN * MIN_PER_HOUR` and
`SEC_PER_MIN * MIN_PER_HOUR * HOUR_PER_DAY`.

Signed-off-by: Jordan Yates <jordan@embeint.com>
1 file changed