power: reset: Disable SDI when dload mode is not supported

Based on the kernel parameter download_mode, disable the SDI
execution. Also disable SDI execution for kernel panic/crash
scenarios. Currently SDI is getting executed for kernel crash/panic
scenarios, but it does not required in these scenarios.

Change-Id: I5a64107e2bf210f82d94ab03c4f86f27f9a330c8
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>