Add Mitsubishi AA084XE01 8.4" XGA TFT LCD panel compatible string.

Link: https://www.mouser.fr/datasheet/2/274/aa084xe01_e-364171.pdfSigned-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230807123138.67443-1-miquel.raynal@bootlin.com