defconfig: arm64: Enable sched debug features on Lahaiana

To be able to debug performance issues related to scheduler and
other scheduler bugs, enable below debug features:
  1. PREEMPTIRQ_EVENTS
  2. PANIC_ON_SCHED_BUG
  3. PANIC_ON_RT_THROTTLING

Change-Id: If3350c3914e0c1590a7536cfb8131d747a075263
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>