wic: code cleanup: wildcard imports

Here is what PEP8(Style Guide for Python Code) says about this:

Wildcard imports (from <module> import *) should be avoided, as they
make it unclear which names are present in the namespace, confusing
both readers and many automated tools.

(From OE-Core rev: 13416c1941f5dc8abcdb0073f2104a89eae2d6f1)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/plugins/source/rawcopy.py

@@ -19,7 +19,7 @@ import os
 
 from wic import msger
 from wic.pluginbase import SourcePlugin
-from wic.utils.oe.misc import *
+from wic.utils.oe.misc import exec_cmd, get_bitbake_var
 
 class RawCopyPlugin(SourcePlugin):
     name = 'rawcopy'