Update the EFI timer to be called once a second

There is no need to call it evert 10ms when we need 1s granularity.
Update to update the time every second.

Reviewed by: imp, manu, tsoome
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D30227

(cherry picked from commit 93f7be080f3ad0bd71190d87aa2043d714270206)