UBUNTU: SAUCE: platform/x86: dell-uart-backlight: add quirk for old platforms

UBUNTU: SAUCE: platform/x86: dell-uart-backlight: add quirk for old platforms

BugLink: https://bugs.launchpad.net/bugs/1813877
Old platforms do not support DELL_UART_GET_SCALAR command and the
behavior of DELL_UART_GET_FIRMWARE_VER command is different as the new
firmware, so the new way to check if the backlight is controlled by
scalar IC doesn't work on old platforms. We now add them into a list and
use the old way to do the check.

Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>