powerpc: Move include files to arch/powerpc/include/asm

from include/asm-powerpc.  This is the result of a

mkdir arch/powerpc/include/asm
git mv include/asm-powerpc/* arch/powerpc/include/asm

Followed by a few documentation/comment fixups and a couple of places
where <asm-powepc/...> was being used explicitly.  Of the latter only
one was outside the arch code and it is a driver only built for powerpc.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

Documentation/powerpc/booting-without-of.txt

@@ -278,7 +278,7 @@ it with special cases.
         a 64-bit platform.
 
         d) request and get assigned a platform number (see PLATFORM_*
-        constants in include/asm-powerpc/processor.h
+        constants in arch/powerpc/include/asm/processor.h
 
 32-bit embedded kernels:
 
@@ -340,7 +340,7 @@ the block to RAM before passing it to the kernel.
 ---------
 
    The kernel is entered with r3 pointing to an area of memory that is
-   roughly described in include/asm-powerpc/prom.h by the structure
+   roughly described in arch/powerpc/include/asm/prom.h by the structure
    boot_param_header:
 
 struct boot_param_header {

Documentation/powerpc/eeh-pci-error-recovery.txt

@@ -133,7 +133,7 @@ error.  Given an arbitrary address, the routine
 pci_get_device_by_addr() will find the pci device associated
 with that address (if any).
 
-The default include/asm-powerpc/io.h macros readb(), inb(), insb(),
+The default arch/powerpc/include/asm/io.h macros readb(), inb(), insb(),
 etc. include a check to see if the i/o read returned all-0xff's.
 If so, these make a call to eeh_dn_check_failure(), which in turn
 asks the firmware if the all-ff's value is the sign of a true EEH

arch/powerpc/boot/io.h

@@ -6,7 +6,7 @@
 /*
  * Low-level I/O routines.
  *
- * Copied from <file:include/asm-powerpc/io.h> (which has no copyright)
+ * Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright)
  */
 static inline int in_8(const volatile unsigned char *addr)
 {