msm: board-8930: Use AUTO mode in PM8038 SMPS 3 sleep set configuration

Change the sleep-set force mode configuration for MSM8930 PM8038
SMPS 3 from LPM to AUTO.  This modification ensures that the
modem processor does not crash in use cases where it is active
and heavily loaded while the Apps processor is asleep.

Change-Id: Id04feb4a0a07b4d27bcdc1f89dd9ffd24acb42d7
CRs-Fixed: 421559
Signed-off-by: David Collins <collinsd@codeaurora.org>