Move CONFIG_DISPLAY_CPUINFO to Makefile

If the whole code is surrounded by #ifdef(CONFIG_ ) .. #endif,
it should be moved to Makefile.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/arm/cpu/arm926ejs/omap/cpuinfo.c b/arch/arm/cpu/arm926ejs/omap/cpuinfo.c
index 02332ee..587d99a 100644
--- a/arch/arm/cpu/arm926ejs/omap/cpuinfo.c
+++ b/arch/arm/cpu/arm926ejs/omap/cpuinfo.c
@@ -13,7 +13,7 @@
 #include <command.h>
 #include <linux/compiler.h>
 
-#if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP)
+#if defined(CONFIG_OMAP)
 
 #define omap_readw(x)		*(volatile unsigned short *)(x)
 #define omap_readl(x)		*(volatile unsigned long *)(x)
@@ -239,4 +239,4 @@
 	return 0;
 }
 
-#endif /* #if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP) */
+#endif /* #if defined(CONFIG_OMAP) */