m68k: sun3: Fix indentation by 5 or 7 spaces

Indentation should use TABs, not spaces.
Fix whitespace in reindented code while at it.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/167216dfe9795056b7a69415695772887aca6d80.1696602993.git.geert@linux-m68k.org