display: Remove lcd_on_expired()/stop_lock_timer()/check_lock_screen()

display: Remove lcd_on_expired()/stop_lock_timer()/check_lock_screen()

These functions are used when the EVENT_INPUT occurs from the below situation,
S_SLEEP/S_LCDOFF --> EVENT_INPUT --> S_NORMAL

check_lock_screen() checks lock_screen state, If lock_screen is not launched,
this adds timeout callback for lcd_on_procedure().
stop_lock_timer() removes callback from above description.
lcd_on_expired() is callback for lcd_on_procedure() after timeout.

Simply, that functions checks lock screen status, and then If lock screen is not launched,
go to lcd_on_procedure after timeout value.

However, according to the default_action code logic, it goes to lcd_on_procedure()
regardless of check_lock_screen().
Also, meaningless lcd_on_procedure() call occurs.

Thus, lcd_on_expired()/stop_lock_timer()/check_lock_screen() is removed.

Change-Id: Ie82889e951678260ac10e1b7c86546040aff3fc8
Signed-off-by: Yunhee Seo <yuni.seo@samsung.com>