exynos_omx: multi_thread: Modified the scheme of reference count inc/dec.

<Old>
    - Call the hw_get_module for reference count processing when receives a buffer of each.
    - Call the hw_get_module every frame, an increase in power consumption.
<New>
    - Call the hw_get_module once on init time.
    - It is a small amount, but the reduction of power consumption.

Change-Id: I8489144ef57a46637c32c869c23032d353830c70
Signed-off-by: SeungBeom Kim <sbcrux.kim@samsung.com>
2 files changed