m68k: merge mmu and non-mmu bitops.h

The following patch merges the mmu and non-mmu versions of the m68k
bitops.h files. Now there is a good deal of difference between the two
files, but none of it is actually an mmu specific difference. It is
all about the specific m68k/coldfire varient we are targeting. So it
makes an awful lot of sense to merge these into a single bitops.h.

There is a number of ways I can see to factor this code. The approach
I have taken here is to keep the various versions of each macro/function
type together. This means that there is some ifdefery with each to handle
each CPU type.

I have added some comments in a couple of appropriate places to try
and make it clear what the differences we are dealing with are.
Specifically the instruction and addressing mode differences we have
to deal with.

The merged form keeps the same underlying optimizations for each CPU
type for all the general bit clear/set/change and find bit operations.
It does switch to using the generic le operations though, instead of
any local varients.

Build tested on ColdFire, 68328, 68360 (which is cpu32) and 68020+.
Run tested on ColdFire and ARAnyM.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/Kconfig

@@ -41,6 +41,10 @@ config NO_DMA
 config ZONE_DMA
 	bool
 	default y
+
+config CPU_HAS_NO_BITFIELDS
+	bool
+
 config HZ
 	int
 	default 1000 if CLEOPATRA

arch/m68k/Kconfig.nommu

@@ -16,6 +16,7 @@ config GENERIC_CLOCKEVENTS
 
 config M68000
 	bool
+	select CPU_HAS_NO_BITFIELDS
 	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
@@ -25,6 +26,7 @@ config M68000
 
 config MCPU32
 	bool
+	select CPU_HAS_NO_BITFIELDS
 	help
 	  The Freescale (was then Motorola) CPU32 is a CPU core that is
 	  based on the 68020 processor. For the most part it is used in
@@ -34,6 +36,7 @@ config COLDFIRE
 	bool
 	select GENERIC_GPIO
 	select ARCH_REQUIRE_GPIOLIB
+	select CPU_HAS_NO_BITFIELDS
 	help
 	  The Freescale ColdFire family of processors is a modern derivitive
 	  of the 68000 processor family. They are mainly targeted at embedded