ALSA: hda/realtek - More constifications

[ Upstream commit 6b0f95c49d890440c01a759c767dfe40e2acdbf2 ]

Apply const prefix to each coef table array.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-4-tiwai@suse.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Stable-dep-of: 90670ef774a8 ("ALSA: hda/realtek: Add a quirk for HP EliteDesk 805")
Signed-off-by: Sasha Levin <sashal@kernel.org>