fbdev fixes and cleanups for 6.9-rc1:

- Allow console fonts up to 64x128 pixels (Samuel Thibault)
- Prevent division-by-zero in fb monitor code (Roman Smirnov)
- Drop Renesas ARM platforms from Mobile LCDC framebuffer driver
  (Geert Uytterhoeven)
- Various code cleanups in viafb, uveafb and mb862xxfb drivers by
  Aleksandr Burakov, Li Zhijian and Michael Ellerman
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