defconfig: msm: enable PREEMPTIRQ_EVENTS for SM8150

To be able to debug performance issues related to scheduler,
preempt and irq disable/enable trace events are needed.

Change-Id: I87e72e60aef287f30b1008fdb145a72b3fc98c5c
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>