video: fbdev: aty: Fix set but not used warnings

Fix W=1 warnings about variables assigned but never used.

- Drop variables that were set but never used
- Make variable definition conditional on ATARI

v2:
  - Fix m68k build error (kernel test robot)
  - Improve subject (Lee Jones)

Signed-off-by: Sam Ravnborg <[email protected]>
Reported-by: kernel test robot <[email protected]> # m68k build fix
Acked-by: Thomas Zimmermann <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Vaibhav Gupta <[email protected]>
Cc: Jason Yan <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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