Input: cros_ec_keyb - handle x86 detachable/convertible Chromebooks

Some detachable/convertible x86 Chromebooks use EC buttons/switches
interface to signal volume up/down and other buttons. This configuration is
signalled via presence of GOOG0007 ACPI device. The main keyboard on such
Chromebooks is still using the standard 8042/atkbd combo.

Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220526231230.2805147-2-dmitry.torokhov@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>