mhi: cntrl: qcom: force a suspend during boot

Soon as device transition to mission mode force a PCIe link
suspend and a resume so device can update PCIe phy sequence.

CRs-Fixed: 2457211
Change-Id: Ic9de5f69c425f7a1a5b8a931930882a9da80c2ad
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>