linux: bump 3.8.x stable version

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

linux/Config.in

@@ -21,7 +21,7 @@ choice
 	prompt "Kernel version"
 
 config BR2_LINUX_KERNEL_3_8
-	bool "3.8.5"
+	bool "3.8.6"
 
 config BR2_LINUX_KERNEL_SAME_AS_HEADERS
 	bool "Same as toolchain kernel headers"