mmc: sdhci-msm: Vote for 0 bandwidth during system suspend

At the end of a request, the work to vote for 0 bandwidth will
be queued to workqueue but during suspend the workqueue can be
freezed causing it to not run. Hence, immediately vote for 0
bandwidth during system suspend.

Change-Id: I8e51a2b76056b280d69a8a36f6608f76a6316aa5
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>