soc: qcom: Create additional ramdump device node for SSR minidump

This change adds a new ramdump device node which is only used to collect
SSR minidump by ramdump process.

Change-Id: I197d135137ce76c09f9e08406cde67c45fd75409
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>
[isaacm@codeaurora.org: Resolve trivial merge conflicts]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>