msm: kgsl: Process null flag and assign new ID for set draw state

If no flags are set in a set draw state packet then that is
an indication to load the state in the packet for the first
time. This situation was not handled corectly while parsing
the set draw state packet, fix this. Also, when saving set
draw commands save it with a new ID defined specifically for
this packet sequence.

Change-Id: I21ff0edf64ad92f62e4caa3e3e825415ba1b5a37
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>