linux: fix 3.8.x stable version

Commit c461e64201598eae85ff32e130ed3f0ccd9fed78 bumped the linux 3.8.x
stable version from 3.8.5 to 3.8.6, but did so in only one of the two places
in which the version number is hard-coded in linux/Config.in

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

linux/Config.in

@@ -76,7 +76,7 @@ config BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "3.8.5" if BR2_LINUX_KERNEL_3_8
+	default "3.8.6" if BR2_LINUX_KERNEL_3_8
 	default BR2_DEFAULT_KERNEL_HEADERS if BR2_LINUX_KERNEL_SAME_AS_HEADERS
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE if BR2_LINUX_KERNEL_CUSTOM_VERSION
 	default "custom" if BR2_LINUX_KERNEL_CUSTOM_TARBALL