ALSA: hda/realtek - Fixed single output machine get empty hp sense

If it only has single output of HP out of machine.
The driver parser will copy hp_pins to line_out_pins.
hp_pins will empty for alc283_init and alc283_shutup functions.
This will cause not have value for hp_pin_sense.
Add check line_out_type code will solve it .

Signed-off-by: Kailang Yang <kailang@realtek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>