dt-bindings: media: meson-ir: Add Meson8b and GXBB compatible strings

dt-bindings: media: meson-ir: Add Meson8b and GXBB compatible strings

New bindings are needed as the register layout on the newer platforms
is slightly different compared to Meson6b.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>