Standardize on _ASM_POWERPC_... prefix for all #include
exclusion symbols.  Fixup all the non-compilers.
Signed-off-by: NJon Loeliger <jdl@freescale.com>
Signed-off-by: NKumar Gala <kumar.gala@freescale.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>