m68k: Kconfig - Remove unneeded "default n"

Reported-by: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/Kconfig

@@ -18,11 +18,9 @@ config RWSEM_XCHGADD_ALGORITHM
 
 config ARCH_HAS_ILOG2_U32
 	bool
-	default n
 
 config ARCH_HAS_ILOG2_U64
 	bool
-	default n
 
 config GENERIC_HWEIGHT
 	bool