arm: Clean up MACH_TYPE_xxx usage after re-sync of mach-types

With the latest mach-types values we have many instances where we no
longer need to define a value and a few cases where the name (but not
value) have changed slightly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/mx6slevk.h b/include/configs/mx6slevk.h
index e54982a..3e7e5a3 100644
--- a/include/configs/mx6slevk.h
+++ b/include/configs/mx6slevk.h
@@ -15,8 +15,7 @@
 #include "imx6_spl.h"
 #endif
 
-#define MACH_TYPE_MX6SLEVK		4307
-#define CONFIG_MACH_TYPE		MACH_TYPE_MX6SLEVK
+#define CONFIG_MACH_TYPE		MACH_TYPE_MX6SL_EVK
 
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN		(3 * SZ_1M)