ARM: dts: msm: Add APQ8096 Auto Dragonboard device support

Update board-id subtype for APQ-8096 based Auto Dragonboard. This
info can be used to differentiate between default apq8096 dragonboard
and dragonboard used in automotive.

cat /sys/devices/soc0/platform_subtype_id
 0 -> APQ8096 Dragonboard
 1 -> APQ8096 Auto Dragonboard

Change-Id: Iabbbb97d979261d31ffecae20c5195228a44d133
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>