ARM: remove CONFIG_ARM920T defines

CONFIG_CPU_ARM920T was introduced into Kconfig by commit 2e07c249a67e
(kconfig: arm: introduce symbol for ARM CPUs).

This commit removes all the defines of CONFIG_ARM920T and replaces the
only reference in drivers/usb/host/ohci-hcd.c with CONFIG_CPU_ARM920T.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/include/configs/edb93xx.h b/include/configs/edb93xx.h
index 47a8420..a82e8bc 100644
--- a/include/configs/edb93xx.h
+++ b/include/configs/edb93xx.h
@@ -85,8 +85,7 @@
 #endif
 
 /* High-level configuration options */
-#define CONFIG_ARM920T		1		/* This is an ARM920T core... */
-#define CONFIG_EP93XX		1		/* in a Cirrus Logic 93xx SoC */
+#define CONFIG_EP93XX		1		/* This is a Cirrus Logic 93xx SoC */
 
 #define CONFIG_SYS_CLK_FREQ	14745600	/* EP93xx has a 14.7456 clock */
 #undef CONFIG_USE_IRQ				/* Don't need IRQ/FIQ */