[POWERPC] include/asm-powerpc/: "extern inline" -> "static inline"

"extern inline" generates a warning with -Wmissing-prototypes and I'm
currently working on getting the kernel cleaned up for adding this to
the CFLAGS since it will help us to avoid a nasty class of runtime
errors.

If there are places that really need a forced inline, __always_inline
would be the correct solution.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 75df3bc..1cd5323 100644
--- a/include/asm-powerpc/io.h
+++ b/include/asm-powerpc/io.h
@@ -302,7 +302,7 @@
 #ifdef CONFIG_PPC32
 
 #define __do_in_asm(name, op)				\
-extern __inline__ unsigned int name(unsigned int port)	\
+static inline unsigned int name(unsigned int port)	\
 {							\
 	unsigned int x;					\
 	__asm__ __volatile__(				\
@@ -329,7 +329,7 @@
 }
 
 #define __do_out_asm(name, op)				\
-extern __inline__ void name(unsigned int val, unsigned int port) \
+static inline void name(unsigned int val, unsigned int port) \
 {							\
 	__asm__ __volatile__(				\
 		"sync\n"				\