ARM: dts: msm: Add qcom,msm-id for msmcobalt

Add the qcom,msm-id property to the msmcobalt device tree
to allow the bootloader to select the appropriate DTB file
on msmcobalt targets.

Change-Id: Ib7c94e3e6a27a7a3a4ab9e159403a1f1e60ca4cd
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>