loapic_timer: Rename global variables and routines
loapic_timer: Rename global variables and routines

Renames the following global variables and routines to both improve
readability and comply with naming conventions:

Variables:
	counterLoadVal          -> cycles_per_tick
	clock_accumulated_count -> accumulated_cycle_count
	max_load_value          -> cycles_per_max_ticks
	idle_original_ticks     -> programmed_full_ticks
	idle_original_count     -> programmed_cycles

Routines:
	_loapicTimerStart()            -> timer_interrupt_unmask()
	_loapicTimerStop()             -> timer_interrupt_mask()
	_loapicTimerSetCount()         -> initial_count_register_set()
	_loapicTimerPeriodic()         -> periodic_mode_set()
	_loapicTimerOneShot()          -> one_shot_mode_set()
	_loapicTimerSetDivider()       -> divide_configuration_register_set()
	_loapicTimerGetRemaining()     -> current_count_register_get()
	_loapicTimerGetCount()         -> initial_count_register_get()
	_loapicTimerTicklessIdleInit() -> tickless_idle_init().

Change-Id: I2c1daa226d846e5be1aaad28d984d9f52bd02c00
Signed-off-by: Peter Mitsis <22bf95476f8cdbda3c8a9a9bf1bdda876f69ea7a@windriver.com>

rsalveti/zephyr,galak/zephyr,bigdinotech/zephyr,explora26/zephyr,zephyriot/zephyr,sharronliu/zephyr,sharronliu/zephyr,punitvara/zephyr,finikorg/zephyr,Vudentz/zephyr,holtmann/zephyr,sharronliu/zephyr,sharronliu/zephyr,fractalclone/zephyr-riscv,runchip/zephyr-cc3220,bigdinotech/zephyr,erwango/zephyr,explora26/zephyr,kraj/zephyr,punitvara/zephyr,fbsder/zephyr,ldts/zephyr,nashif/zephyr,rsalveti/zephyr,galak/zephyr,jamesonwilliams/zephyr-kernel,mirzak/zephyr-os,zephyriot/zephyr,punitvara/zephyr,runchip/zephyr-cc3200,zephyriot/zephyr,coldnew/zephyr-project-fork,nashif/zephyr,32bitmicro/zephyr,pklazy/zephyr,GiulianoFranchetto/zephyr,32bitmicro/zephyr,galak/zephyr,sharronliu/zephyr,zephyrproject-rtos/zephyr,bboozzoo/zephyr,aceofall/zephyr-iotos,ldts/zephyr,tidyjiang8/zephyr-doc,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,holtmann/zephyr,rsalveti/zephyr,Vudentz/zephyr,pklazy/zephyr,runchip/zephyr-cc3200,erwango/zephyr,32bitmicro/zephyr,kraj/zephyr,runchip/zephyr-cc3200,Vudentz/zephyr,zephyrproject-rtos/zephyr,jamesonwilliams/zephyr-kernel,galak/zephyr,tidyjiang8/zephyr-doc,fbsder/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,coldnew/zephyr-project-fork,erwango/zephyr,fractalclone/zephyr-riscv,zephyrproject-rtos/zephyr,32bitmicro/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,pklazy/zephyr,kraj/zephyr,punitvara/zephyr,32bitmicro/zephyr,fbsder/zephyr,bigdinotech/zephyr,pklazy/zephyr,runchip/zephyr-cc3200,explora26/zephyr,holtmann/zephyr,GiulianoFranchetto/zephyr,bboozzoo/zephyr,explora26/zephyr,mbolivar/zephyr,holtmann/zephyr,kraj/zephyr,nashif/zephyr,runchip/zephyr-cc3220,coldnew/zephyr-project-fork,jamesonwilliams/zephyr-kernel,mirzak/zephyr-os,mirzak/zephyr-os,mbolivar/zephyr,runchip/zephyr-cc3220,runchip/zephyr-cc3220,tidyjiang8/zephyr-doc,mbolivar/zephyr,kraj/zephyr,jamesonwilliams/zephyr-kernel,zephyriot/zephyr,jamesonwilliams/zephyr-kernel,mirzak/zephyr-os,rsalveti/zephyr,bigdinotech/zephyr,nashif/zephyr,mbolivar/zephyr,finikorg/zephyr,fbsder/zephyr,bboozzoo/zephyr,coldnew/zephyr-project-fork,fractalclone/zephyr-riscv,ldts/zephyr,fbsder/zephyr,erwango/zephyr,mirzak/zephyr-os,mbolivar/zephyr,punitvara/zephyr,pklazy/zephyr,ldts/zephyr,tidyjiang8/zephyr-doc,finikorg/zephyr,fractalclone/zephyr-riscv,bboozzoo/zephyr,bigdinotech/zephyr,explora26/zephyr,erwango/zephyr,bboozzoo/zephyr,ldts/zephyr,runchip/zephyr-cc3220,coldnew/zephyr-project-fork,aceofall/zephyr-iotos,aceofall/zephyr-iotos,aceofall/zephyr-iotos,GiulianoFranchetto/zephyr,runchip/zephyr-cc3200,holtmann/zephyr,rsalveti/zephyr,Vudentz/zephyr,tidyjiang8/zephyr-doc,Vudentz/zephyr,zephyriot/zephyr,nashif/zephyr,fractalclone/zephyr-riscv,galak/zephyr,Vudentz/zephyr