[ARM] Move prototype for register_isa_ports to asm/io.h

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/io.h b/include/asm-arm/io.h
index b3479fc..bf7b9de 100644
--- a/include/asm-arm/io.h
+++ b/include/asm-arm/io.h
@@ -291,5 +291,12 @@
  */
 #define xlate_dev_kmem_ptr(p)	p
 
+/*
+ * Register ISA memory and port locations for glibc iopl/inb/outb
+ * emulation.
+ */
+extern void register_isa_ports(unsigned int mmio, unsigned int io,
+			       unsigned int io_shift);
+
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_ARM_IO_H */