ALSA: hda/realtek - Fixup headphone noise via runtime suspend

ALSA: hda/realtek - Fixup headphone noise via runtime suspend

BugLink: https://bugs.launchpad.net/bugs/1828798
Dell platform with ALC298.
system enter to runtime suspend. Headphone had noise.
Let Headset Mic not shutup will solve this issue.

[ Fixed minor coding style issues by tiwai ]

Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(backported from commit dad3197da7a3817f27bb24f7fd3c135ffa707202)
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-By: AceLan Kao <acelan.kao@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>