defconfig: quinvmauto: Enable DM_INIT

Enable DM_INIT to support dm-mod.create command line parameter
to mount dm-verity enabled system partition.

Change-Id: Ia9afb608d216f0b3295fa2ebb4d6aebc0a497ef0
Signed-off-by: Venkata Rao Kakani <vkakani@codeaurora.org>