hello-mod: add a module for testing module.bbclass

The following patch creates a hello-mod recipe for building a trivial
out-of-tree kernel module, hello-mod.ko. This demonstrates the hostprogs
build modifications added to module.bbclass. When loaded and unloaded,
the module prints a simple string to the console to demonstrate it was
compiled correctly.

Tested on qemux86 poky-image-sato and beagleboard poky-image-minimal
(after adding hello-mod to the images).

(From OE-Core rev: d4765569d51448e8918bb15e7ab342983344074a)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
CC: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/hello-mod/hello-mod_0.1.bb

@@ -0,0 +1,15 @@
+DESCRIPTION = "hello-world-mod tests the module.bbclass mechanism."
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e"
+
+inherit module
+
+PR = r0
+PV = "0.1"
+
+SRC_URI = "file://Makefile \
+           file://hello.c \
+           file://COPYING \
+          "
+
+S = "${WORKDIR}"