lrdp_v2 : Handle socinfo failure case

It is not necessary to fail ramparser in case socinfo is not
defined in the build. Adding a condition to return None in case
socinfo is not defined in build.

Change-Id: If6c9544b175d12e2d4eeb536cdab5ee2aafed02f
Signed-off-by: Shivendra Pratap <spratap@codeaurora.org>