m68k: simpler m68k and ColdFire CPU's can use generic csum code

We have two implementations of the IP checksuming code for the m68k arch.
One uses the more advanced instructions available in 68020 and above
processors, the other uses the simpler instructions available on the
original 68000 processors and the modern ColdFire processors.

This simpler code is pretty much the same as the generic lib implementation
of the IP csum functions. So lets just switch over to using that. That
means we can completely remove the checksum_no.c file, and only have the
local fast code used for the more complex 68k CPU family members.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index 9af9e68..17d37ed 100644
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -3,6 +3,7 @@
 config M68000
 	bool
 	select CPU_HAS_NO_BITFIELDS
+	select GENERIC_CSUM
 	help
 	  The Freescale (was Motorola) 68000 CPU is the first generation of
 	  the well known M68K family of processors. The CPU core as well as
@@ -23,6 +24,7 @@
 	select GENERIC_GPIO
 	select ARCH_REQUIRE_GPIOLIB
 	select CPU_HAS_NO_BITFIELDS
+	select GENERIC_CSUM
 	help
 	  The Freescale ColdFire family of processors is a modern derivitive
 	  of the 68000 processor family. They are mainly targeted at embedded