uml: revert from 2.6.28.2 to 2.6.28

There are still some issues with 2.6.28.2 (http://patchwork.kernel.org/patch/2458/), and even wth that fixed, uml randomly locks up at boot on some host systems.

SVN-Revision: 14267

target/linux/uml/Makefile

@@ -23,7 +23,7 @@ BOARDNAME:=User Mode Linux
 FEATURES:=ext2
 LINUX_CONFIG:=$(CURDIR)/config/$(ARCH)
 
-LINUX_VERSION:=2.6.28.2
+LINUX_VERSION:=2.6.28
 
 include $(INCLUDE_DIR)/target.mk