drm/panel: mantix-mlaf057we51: write hex in lowercase

Converts uppercase hex to lowercase hex for cleanup.

Signed-off-by: Tejas Vipin <tejasvipin76@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240820091556.1032726-3-tejasvipin76@gmail.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240820091556.1032726-3-tejasvipin76@gmail.com