ARM: dts: msm: Dual SOC ID for Dragonboard 8094

Part of the Dragonboard devices are assembled
with APQ8094, which identifies itself as MSM8994.
The others are assembled with APQ8094,
which identifies itself as APQ8094.
Adding support for both variants.

Change-Id: Ia130d0fd1655b71f116b171da8c60172fcad7a3b
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>