ARM: dts: msm: Add vm-linux as chain partition for sm8150

Add support for vm-linux as chain partition from device tree.
Set Status="" to avoid mounting at init

Change-Id: I00d9b3ae90b2118cd30116ff9b982284cacaca9e
Signed-off-by: Vivek Tryambake <vtryamba@codeaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>