fix wrong shift value for cpu_is_omap24xx, cpu_is_omap23xx macros

Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

include/asm-arm/arch-omap/cpu.h

@@ -88,7 +88,7 @@ static inline int is_omap ##class (void)		\
 	return (GET_OMAP_CLASS == (id)) ? 1 : 0;	\
 }
 
-#define GET_OMAP_SUBCLASS	((system_rev >> 16) & 0x0fff)
+#define GET_OMAP_SUBCLASS	((system_rev >> 20) & 0x0fff)
 
 #define IS_OMAP_SUBCLASS(subclass, id)			\
 static inline int is_omap ##subclass (void)		\