m68k: Remove obsolete config NO_KERNEL_MSG

The use of the config NO_KERNEL_MSG is long gone. Remove this config from
m68k's debug kernel configuration setup.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20230320123202.14474-1-lukas.bulwahn@gmail.com


Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>