drm/panel: Extend ACX424AKP bindings to ACX424AKM

The panel ACX424AKP seems to only be used in prototypes, whereas
real products use the 10 pixels shorter ACX424AKM. Extend the
ACX424AKP bindings to also cover the ACX424AKM. The ACX424AKM
was used in a few different mobile phones from Sony Mobile.

Cc: devicetree@vger.kernel.org
Cc: phone-devel@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220103093501.637323-1-linus.walleij@linaro.org