ARM: dts: msm: configure MHI EFS device as a wake capable device for sm8150

EFS channel transfer is time sensitive that needs to be
processed before any system suspends. Therefore, configure it as
a wake-up channel.

CRs-Fixed: 2348867
Change-Id: I54fd76b8cb5d17565dc197d5c6c7a9b1419e8773
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>