Revert "defconfig: msm: disable PM_AUTOSLEEP for sm6150"

This reverts commit 6453f33d("defconfig:
msm:disable PM_AUTOSLEEP for sm6150").PM_AUTOSLEEP config is needed
for QCS610.LE target for LPM test cases.

Change-Id: I73eccb7301d38221164cb8cb636669c963d30f8e
Signed-off-by: Naitik Bharadiya <bharad@codeaurora.org>