Use the correct compatible so that the driver can probe properly.

Fixes: a6dd1206 ("arm64: dts: qcom: sm8450: add display hardware devices")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on HDK8450
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230123200552.553181-1-konrad.dybcio@linaro.org