vendor_kernel_boot: Update releasetools for vendor_kernel_boot

add_img_to_target_files.py will re-make image and build a new
signed vbmeta.img with new images in target-file.
We need to add vendor_kernel_boot into AVB signing list and make it
support that image.

Test: make dist -j110 and check vbmeta.img
Bug: 214409109
Signed-off-by: Lucas Wei <lucaswei@google.com>
Change-Id: Id07433f3dc33f95e2edd49de890f1e098cb9ef31
diff --git a/tools/releasetools/add_img_to_target_files.py b/tools/releasetools/add_img_to_target_files.py
index e3db161..09f69d0 100644
--- a/tools/releasetools/add_img_to_target_files.py
+++ b/tools/releasetools/add_img_to_target_files.py
@@ -871,7 +871,7 @@
 
   if has_vendor_kernel_boot:
     banner("vendor_kernel_boot")
-    vendor_kernel_boot_image = common.GetVendorBootImage(
+    vendor_kernel_boot_image = common.GetVendorKernelBootImage(
         "IMAGES/vendor_kernel_boot.img", "vendor_kernel_boot.img", OPTIONS.input_tmp,
         "VENDOR_KERNEL_BOOT")
     if vendor_kernel_boot_image: