Use index zero, not one. The Xtensa tools emit the timers in priority
order, and as mentioned in the kconfig warnings using high priority
timers doesn't work. This also makes room for using software
interrupts that can preempt a timer interrupt for test purposes.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Split Kconfig into individual files for each driver. This improves
overall readability of the Kconfig options.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>