display: Relocate lcd_on/off_procedure()

display: Relocate lcd_on/off_procedure()

lcd_on/off_procedure() rules are same in all plugins except wearable.
Thus, duplicated codes are removed and relocated to display-panel.

These functions are added below display-panel.
- void display_panel_lcd_on_procedure(int state, enum device_flags flag);
    -> This replaces lcd_on_procedure(), it works to turn on lcd.
- void display_panel_lcd_off_procedure(enum device_flags flag);
    -> This replaces lcd_off_procedure(), it works to turn off lcd.
- bool display_panel_is_lcd_on_state_broadcasted(void);
    -> With this, It is possible to know if the lcd_on/off_procedure() done.
       This is used as flag of lcd on/off process.

This function is added below display-plugin.
- int display_plugin_lcd_off_procedure(enum device_flags flag);
    -> This is for wearable plugin, there is lcd_off_procedure() use case in the key-filter.c

Change-Id: I1a7f8268df4d45d0585fe7c8a93981cc7be4268c
Signed-off-by: Yunhee Seo <yuni.seo@samsung.com>