ARM: remove CONFIG_ARM926EJS defines

CONFIG_CPU_ARM926EJS was introduced into Kconfig by commit 2e07c249a67e
(kconfig: arm: introduce symbol for ARM CPUs).

This commit removes all the defines of CONFIG_ARM926EJS and replaces
the only reference in arch/arm/lib/cache.c with CONFIG_CPU_ARM926EJS.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/include/configs/versatile.h b/include/configs/versatile.h
index 29c32fe..900b89c 100644
--- a/include/configs/versatile.h
+++ b/include/configs/versatile.h
@@ -19,8 +19,7 @@
  * High Level Configuration Options
  * (easy to change)
  */
-#define CONFIG_ARM926EJS	1	/* This is an arm926ejs CPU core */
-#define CONFIG_VERSATILE	1	/* in Versatile Platform Board	*/
+#define CONFIG_VERSATILE	1	/* This is Versatile Platform Board	*/
 #define CONFIG_ARCH_VERSATILE	1	/* Specifically, a Versatile	*/
 
 #define CONFIG_SYS_MEMTEST_START	0x100000