Integrate meta-seconorth-machine/u-boot-multiple-devicetrees

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Commit: seco-ne/yocto/layers/meta-seconorth-machine@34ac23c2

u-boot:mc3: Add support for multiple devicetrees for u-boot and imx-boot

Adding new variable UBOOT_ADDITIONAL_DTB_NAMES to specify more then one
devicetree, use it in the u-boot and the imx-boot recipe to integrate
everything into one fit image.

imx-boot needs a patch, to use the addional devicetrees in the makefile
when writing the fit image.

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="1d6853b16db7dd3c555cddb41524857f3ed4e71f"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
+    <project name="layers/meta-seconorth-machine"   revision="34ac23c23151c9ea14b3091ab0b3948417f495ce"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
     <project name="layers/meta-seconorth-distro"    revision="85922818a01ab15fde1688de2ae6ee7176eff6d7"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
     <project name="layers/meta-seconorth-nogplv3"   revision="0b4aed13d723e035355d8252df8ef34a992981f4"  remote="seco-ne"      path="sources/meta-seconorth-nogplv3"    />
     <project name="config"                          revision="e57685b9caa6383957efe586b6174bcadcbdb179"  remote="seco-ne"      path=".conf"                              >