target_files: copy to PRODUCT-SERVICES instead

The add_img_to_target_files.py script uses upper() to determine
the name of sub-directory under target_files_intermediates. The
name of the image is product-services.img but the sub-directory
name was PRODUCT_SERVICES. Change it to PRODUCT-SERVICES so that
'm dist' works.

Test: m dist
Change-Id: I8cad841c674b5d62c1d803d0383fc3aee14f272a
diff --git a/tools/releasetools/add_img_to_target_files.py b/tools/releasetools/add_img_to_target_files.py
index f7324bd..9bf1b5d 100755
--- a/tools/releasetools/add_img_to_target_files.py
+++ b/tools/releasetools/add_img_to_target_files.py
@@ -197,7 +197,7 @@
 
 
 def AddProductServices(output_zip):
-  """Turn the contents of PRODUCT_SERVICES into a product-services image and
+  """Turn the contents of PRODUCT-SERVICES into a product-services image and
   store it in output_zip."""
 
   img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES",
@@ -654,7 +654,7 @@
                  os.path.exists(os.path.join(OPTIONS.input_tmp, "IMAGES",
                                              "product.img")))
   has_product_services = (os.path.isdir(os.path.join(OPTIONS.input_tmp,
-                                                     "PRODUCT_SERVICES")) or
+                                                     "PRODUCT-SERVICES")) or
                           os.path.exists(os.path.join(OPTIONS.input_tmp,
                                                       "IMAGES",
                                                       "product-services.img")))