ALSA: hda/realtek - Use a common helper for hp pin reference

BugLink: https://launchpad.net/bugs/1831065
Replace the open-codes in many places with a new common helper for
performing the same thing: referring to the primary headphone pin.

This eventually fixes the potentially missing headphone pin on some
weird devices, too.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(cherry picked from commit 35a39f98567d8d3f1cea48f0f30de1a7e736b644)
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Connor Kuehl <connor.kuehl@canonical.com>
Acked-by: Anthony Wong <anthony.wong@canonical.com>
Acked-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>