releasetools: Fix the reference to OPTIONS.info_dict.

sign_target_files_apks.py calls common.GetBootableImage() but without
calling 'OPTIONS = common.OPTIONS' first. In common.GetBootableImage(),
we should use the local info_dict parameter instead of OPTIONS.info_dict.

Test: sign_target_files_apks.py generates signed-TF.zip successfully.

Change-Id: Ia3d32b88691c26e5fb98feea709e3e3c3eb70fdb
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 564cd17..fad6a5e 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -514,13 +514,13 @@
     img_keyblock.close()
 
   # AVB: if enabled, calculate and add hash to boot.img.
-  if OPTIONS.info_dict.get("board_avb_enable", None) == "true":
+  if info_dict.get("board_avb_enable", None) == "true":
     avbtool = os.getenv('AVBTOOL') or "avbtool"
-    part_size = OPTIONS.info_dict.get("boot_size", None)
+    part_size = info_dict.get("boot_size", None)
     cmd = [avbtool, "add_hash_footer", "--image", img.name,
            "--partition_size", str(part_size), "--partition_name", "boot"]
     AppendAVBSigningArgs(cmd)
-    args = OPTIONS.info_dict.get("board_avb_boot_add_hash_footer_args", None)
+    args = info_dict.get("board_avb_boot_add_hash_footer_args", None)
     if args and args.strip():
       cmd.extend(shlex.split(args))
     p = Run(cmd, stdout=subprocess.PIPE)