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

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

Change-Id: I3af5c15798d3c74896a499c8db30e5733743f106
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>