hpet: remove unused HPET_TIMER_DEBUG option
hpet: remove unused HPET_TIMER_DEBUG option

This option is not used anywhere and was removed when the hpet driver
was rewritten.

Signed-off-by: Anas Nashif <0d9952ec84ac43c159f6b7e7ed99a9080c00dd6e@intel.com>

Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,ldts/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,ldts/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,nashif/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,explora26/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,explora26/zephyr,explora26/zephyr,Vudentz/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,explora26/zephyr,nashif/zephyr,galak/zephyr