Integrate meta-seconorth-distro/remove_getty_on_tty1

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@7f37be85

systemd:networkd: Added comment to remove of networkd

The removal of networkd is done via "remove-variable" which isn't explained
sufficiently. Added a comment regarding the concrete operation of the
"remove-variable".

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@14d0809f

systemd:getty: Removed default getty instance on tty1

The getty service starts a default instance on tty1. This instance appears as
a login prompt on our HMIs which isn't the expected behavior for our customers.
The patch removes the installation of the default instance.

default.xml

@@ -22,7 +22,7 @@
     <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="d87f2c9f8fedce1116be36c33bd88616ec65f98a"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
-    <project name="layers/meta-seconorth-distro"    revision="c738078b446969e9fa081f3cc66912f4415a193a"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
+    <project name="layers/meta-seconorth-distro"    revision="7f37be858546fcb8fd830d42e9bd0e320595604d"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
     <project name="layers/meta-seconorth-nogplv3"   revision="df1cad973746455b60715b73758fbe9efe80e57d"  remote="seco-ne"      path="sources/meta-seconorth-nogplv3"    />
     <project name="config"                          revision="e055264027aa5f3621d6d4e6c11ce88b252efcd0"  remote="seco-ne"      path=".conf"                              >
         <linkfile dest="setup-environment" src="setup-environment" />