Add template for generating lynx vendor blobs

Also add template for factory image

TEST:generated blobs from artifacts. Flashed device

BUG: 240203789
Change-Id: If7c12b263d914af95b3bba0566a95914b60950f7

self-extractors/PART3

@@ -0,0 +1,12 @@
+
+if test $? != 0
+then
+  echo
+  echo ERROR: Couldn\'t extract files. 1>&2
+  exit 3
+else
+  echo
+  echo Files extracted successfully.
+fi
+exit 0
+