dt-bindings: trivial-devices: Add delta,q54sj108a2

Add delta,q54sj108a2 to trivial-devices.yaml.

Signed-off-by: xiao.ma <xiao.mx.ma@deltaww.com>
Link: https://lore.kernel.org/r/20201202072610.1666-1-max701@126.com


Signed-off-by: Rob Herring <robh@kernel.org>