mhi: core: add support for wake capable devices

Some MHI channels has time sensitive data and must
meet required deadline. Configure those channels as
wakeup device.

CRs-Fixed: 2348867
Change-Id: Id9cf7ff54d9bf7e4c44a83bca8de5cb9936c12a8
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>