wic: Move some common items to oe.misc

Move a couple items into a more common location since they're going to
need to be accessible from source plugins.

(From OE-Core rev: 95ca523949e838850b5afa090ba16f91b8557c12)

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/mic/utils/oe/misc.py

@@ -106,3 +106,15 @@ def get_wks_var(key):
 
 def add_wks_var(key, val):
     wks_vars[key] = val
+
+BOOTDD_EXTRA_SPACE = 16384
+
+def get_line_val(line, key):
+    """
+    Extract the value from the VAR="val" string
+    """
+    if line.startswith(key + "="):
+        stripped_line = line.split('=')[1]
+        stripped_line = stripped_line.replace('\"', '')
+        return stripped_line
+    return None