[graph/manager] Enable memory v1 optimizations

[graph/manager] Enable memory v1 optimizations

This patch adds interface to enable memory optimizations with the neural
network. Enabling the interface changes the planner being used for the
memory allocation.
With this patch, OptimizedV1Planner is put to use when enabling
optimizations.

Unittest of models is updated to disable optimizations in the
non-optimized test cases.

Signed-off-by: Parichay Kapoor <pk.kapoor@samsung.com>