Disintegrate asm/system.h for PowerPC

Disintegrate asm/system.h for PowerPC.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
cc: linuxppc-dev@lists.ozlabs.org
diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index 01c143b..9d6c37a 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -325,5 +325,7 @@
 static inline int page_is_rtas_user_buf(unsigned long pfn) { return 0;}
 #endif
 
+extern int call_rtas(const char *, int, int, unsigned long *, ...);
+
 #endif /* __KERNEL__ */
 #endif /* _POWERPC_RTAS_H */