drm/stm: ltdc: remove reload interrupt

The reload interrupt is not used by the driver. To avoid
unnecessary calls of the interrupt routine, don't enable it.
Solve small typo and add mask to simplify the driver.

Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240712131453.98597-1-yannick.fertre@foss.st.com


Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>