msm: vidc: added ddr_type to video core information

Test app needs ddr type information in order to 
properly interpret video core output.
Usage: “cat /d/msm_vidc/core0/info".

CRs-Fixed: 2384822
Change-Id: Icb4f5c5cb828757a4730183ab4f067bf40348cfa
Signed-off-by: Darshana Patil <darshana@codeaurora.org>