timer: Revert "timer: HPET is also a lock free readable timer"
timer: Revert "timer: HPET is also a lock free readable timer"

This seems to have caused CI failures and its unclear why just yet
so revert instead.

This reverts commit cbee9e9fdd8060d0ca4e91037b3f99f631e4b1a5.

Signed-off-by: Tom Burdick <63c280986e32082c9e27a1a69ac8b19e3d0c6b4b@intel.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,galak/zephyr