Revert "devtool: make add_md5 a public API"

This reverts commit 69c63728da.

Moved add_md5 back to standard.py as it's not used in
any plugin anymore.

(From OE-Core rev: 3823b7abf8c1e82e0448d7283de95422fd262135)

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

scripts/lib/devtool/__init__.py

@@ -110,13 +110,6 @@ def setup_tinfoil(config_only=False):
     tinfoil.logger.setLevel(logger.getEffectiveLevel())
     return tinfoil
 
-def add_md5(config, recipename, filename):
-    """Record checksum of a recipe to the md5-file of the workspace"""
-    import bb.utils
-    md5 = bb.utils.md5_file(filename)
-    with open(os.path.join(config.workspace_path, '.devtool_md5'), 'a') as f:
-        f.write('%s|%s|%s\n' % (recipename, os.path.relpath(filename, config.workspace_path), md5))
-
 def get_recipe_file(cooker, pn):
     """Find recipe file corresponding a package name"""
     import oe.recipeutils