linux: support a space-separated list of patches

The kernel being a component that often needs a fairly important set
of changes to be adapted to a particular hardware platform, having
maximum flexibility on the patching process is a nice
thing. Therefore, as per the discussions from the Buildroot Developer
Day, we add a mechanism to apply a list of patches (that could come
either from URLs, local files or local directories).

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/linux/Config.in b/linux/Config.in
index 7b781a4..4ded38b 100644
--- a/linux/Config.in
+++ b/linux/Config.in
@@ -70,11 +70,12 @@
 #
 
 config BR2_LINUX_KERNEL_PATCH
-	string "Custom kernel patch"
+	string "Custom kernel patches"
 	help
-         The location can be an URL, a file path, or a directory. In
-         the case of a directory, all files matching linux-*.patch
-         will be applied.
+	  A space-separated list of patches to apply to the
+	  kernel. Each patch can be described as an URL, a local file
+	  path, or a directory. In the case of a directory, all files
+	  matching linux-*.patch in the directory will be applied.
 
 #
 # Configuration selection