Prepare v2012.04.01

Signed-off-by: Wolfgang Denk <wd@denx.de>

Makefile

@@ -23,7 +23,7 @@
 
 VERSION = 2012
 PATCHLEVEL = 04
-SUBLEVEL =
+SUBLEVEL = 01
 EXTRAVERSION =
 ifneq "$(SUBLEVEL)" ""
 U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)