Integrate meta-seconorth-machine/add_boot_bus

--

Commit: seco-ne/yocto/layers/meta-seconorth-machine@efe603b7

u-boot:mkimage: Removed include file for custom mkimage

We don't use the custom mkimage anymore and the include file can
therefore be removed.

default.xml

@@ -21,7 +21,7 @@
     <project name="meta-qt5.git"                    revision="5b71df60e523423b9df6793de9387f87a149ac42"  remote="qt5-github"   path="sources/meta-qt5"                  />
     <project name="meta-freescale.git"              revision="dd98526300937450d741c9b3403799632f417226"  remote="fslc"         path="sources/meta-freescale"            />
     <project name="meta-freescale-distro.git"       revision="fc15f5003043da23212596be7366ae2547c308ad"  remote="fslc"         path="sources/meta-freescale-distro"     />
-    <project name="layers/meta-seconorth-machine"   revision="051bf34d9b0bc02fcdf6496a2ec332e62a734b07"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
+    <project name="layers/meta-seconorth-machine"   revision="efe603b7cd151a3f34fab0adbbf44e4ccb65051f"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
     <project name="layers/meta-seconorth-distro"    revision="f56156d525ed18e452577bd4e5bcff2d2aa0372c"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
     <project name="layers/meta-seconorth-nogplv3"   revision="6b15d1191f52acf9170a0aec581734b78089a7f8"  remote="seco-ne"      path="sources/meta-seconorth-nogplv3"    />
     <project name="config"                          revision="a6adcefe3c32b5c541ad5110d5b5098eb556411d"  remote="seco-ne"      path=".conf"                              >