meta-skeleton: add linux-yocto-custom reference recipe

Adding a skeleton/refrence recipe for using a subset of the yocto
kernel tools against kernel git repositories.

Sample/reference configuration fragments, features and a patch are
provided and documented in the recipe.

From the recipe itself:

   Provides an example/minimal kernel recipe that uses the linux-yocto
   and oe-core kernel classes to apply a subset of yocto kernel
   management to git managed kernel repositories.

 Notes:

   kconfig(s): the kernel must be configured with a defconfig, or via
               configuration fragment(s). Either of these can be added
               via bbappend.
   patches: patches can be merged into to the source git tree itself, added
            using standard bbappend syntax or controlled via .scc feature
            descriptions (also via bbappends)

   example configuration addition:
            SRC_URI += "file://smp.cfg"
   example patch addition (for kernel v3.4 only):
            SRC_URI += "file://0001-linux-version-tweak.patch
   example feature addition (for kernel v3.4 only):
            SRC_URI += "file://feature.scc"

 Warning:

   Building the sample kernel tree (kernel.org) without providing any
   configuration will result in build or boot errors. This is not a bug
   it is a required element for creating a valid kernel.

[YOCTO #2397]

(From OE-Core rev: 4b6f29ddb00480896f47d96ea376f3a6f6d8451e)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-skeleton/recipes-kernel/linux/linux-yocto-custom/0001-linux-version-tweak.patch

@@ -0,0 +1,26 @@
+From 5a55943a6bbb10a79994a0b18071b2427dffb15f Mon Sep 17 00:00:00 2001
+From: Bruce Ashfield <bruce.ashfield@windriver.com>
+Date: Mon, 11 Jun 2012 15:31:42 -0400
+Subject: [PATCH] linux: version tweak
+
+Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
+---
+ Makefile |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index a687963..f5b1ac3 100644
+--- a/Makefile
++++ b/Makefile
+@@ -2,7 +2,7 @@ VERSION = 3
+ PATCHLEVEL = 4
+ SUBLEVEL = 0
+ EXTRAVERSION =
+-NAME = Saber-toothed Squirrel
++NAME = Saber-toothed Squirrel-custom
+ 
+ # *DOCUMENTATION*
+ # To see a list of typical targets execute "make help"
+-- 
+1.7.5.4
+

meta-skeleton/recipes-kernel/linux/linux-yocto-custom/feature.scc

@@ -0,0 +1 @@
+patch 0001-linux-version-tweak.patch

meta-skeleton/recipes-kernel/linux/linux-yocto-custom/smp.cfg

@@ -0,0 +1 @@
+# CONFIG_SMP is not set