include/asm-arm/arch-ixp4xx: Consolidate check_signature

The check_signature function is now in linux/include/io.h. This platform was missed in the previous consolidation.

diff -ur a/include/asm-arm/arch-ixp4xx/io.h b/include/asm-arm/arch-ixp4xx/io.h
@@ -238,23 +238,6 @@
 #define memcpy_fromio(a,c,l)		_memcpy_fromio((a),(c),(l))
 #define memcpy_toio(c,a,l)		_memcpy_toio((c),(a),(l))
 
-static inline int
-check_signature(const unsigned char __iomem *bus_addr, const unsigned char

*signature,
- int length)
-{
- int retval = 0;
- do {
- if (readb(bus_addr) != *signature)
- goto out;
- bus_addr++;
- signature++;
- length--;
- } while (length);
- retval = 1;
-out:
- return retval;
-}
-
#endif

#ifndef CONFIG_PCI