kernel: remove unused versions

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42462 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/kernel-version.mk

@@ -5,15 +5,9 @@ LINUX_RELEASE?=1
 ifeq ($(LINUX_VERSION),3.3.8)
   LINUX_KERNEL_MD5SUM:=f1058f64eed085deb44f10cee8541d50
 endif
-ifeq ($(LINUX_VERSION),3.6.11)
-  LINUX_KERNEL_MD5SUM:=3d602ad7f7984509c3e923a5ae90bc54
-endif
 ifeq ($(LINUX_VERSION),3.8.13)
   LINUX_KERNEL_MD5SUM:=2af19d06cd47ec459519159cdd10542d
 endif
-ifeq ($(LINUX_VERSION),3.9.11)
-  LINUX_KERNEL_MD5SUM:=edbf88eb7f7d34dbd5d3887726790755
-endif
 ifeq ($(LINUX_VERSION),3.10.49)
   LINUX_KERNEL_MD5SUM:=9774e12764e740d49c80eda77d0ef3eb
 endif