msm: sdio: Add support for sdio download restarts

The existing downloader setup doesn't handle modem restart use cases.
Add support to be able to handle this.

Change-Id: I10e3755ef1d4857e228e931e60c80f1df3c692e2
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>