powerpc: Ensure global functions include their prototype

Fix a number of places where global functions were not including
their prototype. This ensures the prototype and the function match.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/oprofile/backtrace.c

@@ -12,6 +12,7 @@
 #include <asm/processor.h>
 #include <asm/uaccess.h>
 #include <asm/compat.h>
+#include <asm/oprofile_impl.h>
 
 #define STACK_SP(STACK)		*(STACK)