display: Relocate default_proc_change_state()/default_proc_change_state_action()

display: Relocate default_proc_change_state()/default_proc_change_state_action()

Above two functions are used for display-lock related functions.
default_proc_change_state_action() sets pm_cur_state and occurs state_action.
default_proc_change_state() occurs next state action when the specific condition is met.

These functions are added to display-plugin.
- bool display_plugin_state_is_there_proc_change_state(void);
- int display_plugin_state_proc_change_state(unsigned int cond, pid_t pid);

These functions are added to display-state-transition.
- void display_state_transition_do_proc_change_state_action(enum state_t next, int timeout);
- int display_state_transition_do_proc_change_state(unsigned int cond, pid_t pid);

Newly added functions should also be refactored.

Change-Id: I85476642bb4b4c4fc5c607ce6ce0591736d1a014
Signed-off-by: Yunhee Seo <yuni.seo@samsung.com>