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/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 4e597a4..d0863da 100644
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -23,12 +23,12 @@
 
 #endif /* CONFIG_ARM1136 */
 
-#ifdef CONFIG_ARM926EJS
+#ifdef CONFIG_CPU_ARM926EJS
 	/* test and clean, page 2-23 of arm926ejs manual */
 	asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
 	/* disable write buffer as well (page 2-22) */
 	asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
-#endif /* CONFIG_ARM926EJS */
+#endif /* CONFIG_CPU_ARM926EJS */
 	return;
 }