mhi: cntrl: qcom: temporarily disable MHI suspend

Reject all suspends temporarily until all dependent changes to
support suspend is available on builds.

CRs-Fixed: 2418347
Change-Id: I06a219353ea30d672f2c50441534fe8f2737c7a5
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>