new_codec: changed a way to use device memory effectively.

new_codec: changed a way to use device memory effectively.

Divide device memory into small, medium and large size of buffer
to use the memory effectively when decoding many contexts.

In case of meta data such as width, height, framerate and etc,
each context uses 256byte memory region and utilizes the large size of memory
when copying video and audio buffer,

Change-Id: I735849d3c8291e7b8922aff2b9a47f12edf35a85
Signed-off-by: Kitae Kim <kt920.kim@samsung.com>