defconfig: sdm845: Disable panic on rcu and soft lockups

RCU stall and softlock up issues happen during stress test and panicking
on every stall and softlock up results into early termination of stress
tests.

Change-Id: Ibe4dcfc92610b38e6bfe51a4e85860cbdf6b94c0
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>