msm: kgsl: Save the memory objects in cp_load_state packets

Simplyfy the logic to detect and save memory objects found in
cp_load_state packets. The packet definition can vary between
GPU cores so one logic does not fit all, it's better to simplify
the logic and just save memory if the data in the packet
corresponds to a memory.

Change-Id: Ifad6fc85f5ca2a551b69960f8321e5e4deda70cc
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>