soc: qcom: Flush mapping of cma memory before secure authentication

This change flush all stale mapping of cma allocated buffer from cache
before passing buffer to secure layer for authentication.

Also free the memory allocated for ramdump collection.

Change-Id: I4479af296e9fad2c090bc3cef23ad11ad31a7369
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>