[ARM] 2909/1: remove IXP2000_PROD_ID

Patch from Lennert Buytenhek

The intel docs call it IXP2000_PRODUCT_ID, and we have a definition
for IXP2000_PRODUCT_ID as well, so IXP2000_PROD_ID can go.  It's only
used in one place.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/arch-ixp2000/ixp2000-regs.h

@@ -370,8 +370,6 @@
 #define GLOBAL_REG_BASE			(IXP2000_GLOBAL_REG_VIRT_BASE + 0x0a00)
 #define GLOBAL_REG(x)			(volatile unsigned long*)(GLOBAL_REG_BASE | (x))
 
-#define IXP2000_PROD_ID			GLOBAL_REG(0x00)
-
 #define IXP2000_MAJ_PROD_TYPE_MASK	0x001F0000
 #define IXP2000_MAJ_PROD_TYPE_IXP2000	0x00000000
 #define IXP2000_MIN_PROD_TYPE_MASK 	0x0000FF00

include/asm-arm/arch-ixp2000/platform.h

@@ -88,7 +88,7 @@ void ixp2000_release_slowport(struct slowport_cfg *);
  */
 static inline unsigned ixp2000_has_broken_slowport(void)
 {
-	unsigned long id = *IXP2000_PROD_ID;
+	unsigned long id = *IXP2000_PRODUCT_ID;
 	unsigned long id_prod = id & (IXP2000_MAJ_PROD_TYPE_MASK |
 				      IXP2000_MIN_PROD_TYPE_MASK);
 	return (((id_prod ==