On a HP ZCentral, the front Mic could not be detected.

The codec of the HP ZCentrol is alc671 and it needs to override the pin
configuration to enable the headset mic.
Signed-off-by: Jeremy Szu <jeremy.szu@canonical.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201008105645.65505-1-jeremy.szu@canonical.comSigned-off-by: Takashi Iwai <tiwai@suse.de>