[ARM] 4296/1: ixp4xx: compile fix

Fix compilation fail for ixp4xx platforms for the case when CONFIG_IXP4XX_INDIRECT_PCI is set. That is due to the check_signature() is appeared in include/linux/io.h.
Signed-off-by: NVladimir Barinov <vbarinov@ru.mvista.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/arch-ixp4xx/io.h

@@ -238,23 +238,6 @@ __ixp4xx_readsl(const volatile void __iomem *bus_addr, u32 *vaddr, u32 count)
 #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