Declare deprecation of sound_manager_set_current_sound_type() since tizen 3.0.

Declare deprecation of sound_manager_set_current_sound_type() since tizen 3.0.

This function is usually used between volume-application and media-application which is right below
of the volume-application from window system point of view. Obviously, it is related to window system.
So, we decide to deprecate this incomplete functionality in sound-manager since tizen 3.0 and expect
to be provided it from other APIs.

[Version] 0.3.66
[Profile] Common
[Issue Type] Deprecation

Change-Id: If72162b0f27b1dfac17e2f5fe18efb9d2447f823
Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>