msm: ipa: vote for device side through mhi for tethering use cases

Specify MHI_VOTE_DEVICE flag when calling mhi-driver API:
mhi_device_get_sync to make sure device side PCIE won't
get to power collapse.

Change-Id: Ia254d3bdbc191f80af05224df4b272921aba2d10
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>