DeviceInfoSettings: Update the cpuinfo parser

Parsing /proc/cpuinfo for the processor type assumes a format that
isn't true in later kernel versions. Update the parser to be more
generic and search specifically for the "Processor" descriptor

Change-Id: I9d5bbf29a8383fcb9357a6950dea4202b05f50ab
(cherry picked from commit 769b6c521a48b9be6cd2f660629e9d7500810734)