power: reset: Disable sdi if the CONFIG_MSM_DLOAD_MODE is not defined

Set download_mode as 0 if the CONFIG_MSM_DLOAD_MODE is not defined.
So the sdi could be disabled when the driver initially starts.

And fixed build error when the CONFIG_MSM_DLOAD_MODE is not defined.

CRs-fixed: 1034475
Change-Id: I7f9e3b4231f091e69ba55d22b42db6f5964cb5b9
Signed-off-by: Lijuan Gao <lijuang@codeaurora.org>