mhi: core: add missing break in fast resume path

When resuming from fast suspend, MHI sees that device wake
remains asserted if device was previously in M0. This causes
power regression on the device. Avoid asserting device wake
twice if we moved to fast suspend from MHI M0 state.

CRs-Fixed: 2511779
Change-Id: Iaf754ea1bc488dae1bb39dfbbd1ed2e898f3eb1f
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>