UBUNTU: SAUCE: (no-up) ASoC: rt5660: Add ACPI support

UBUNTU: SAUCE: (no-up) ASoC: rt5660: Add ACPI support

BugLink: http://bugs.launchpad.net/bugs/1657674
On Dell IoT Gateways, RT5660 codec is available with ACPI ID 10EC3277.
Also, GPIO's are only available by index, so we register mappings to allow
machine drivers to access them by name.

Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
(cherry picked from commit 08b421848245f749d449f8db4d664e377f8100e3)
(source: git://kernel.ubuntu.com/ubuntu/ubuntu-xenial.git)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>