Skip building boot-(test-harness|debug).img if not needed

boot-(test-harness|debug).img is not needed for devices with
a /vendor_boot partition. They can use vendor_boot-(test-harness|debug).img
instead.

(Cherry-picked with Ic032b8594f776f911d7b6345a97d64fed930d890 to
solve merge conflict.)

Bug: 200945738
Bug: 196001476
Test: make then checks $OUT/*.img
Change-Id: If76df0329c96f718ebf0a0ac138cde3ae859a6c6
Merged-In: If76df0329c96f718ebf0a0ac138cde3ae859a6c6
(cherry picked from commit 4bb4d1fb9165b124f67bb6f405503ca4ae1ecef2)
diff --git a/core/Makefile b/core/Makefile
index 2d56edb..a10e93d 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2398,6 +2398,7 @@
 #
 # Note: it's intentional to skip signing for boot-debug.img, because it
 # can only be used if the device is unlocked with verification error.
+ifneq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
 ifneq ($(INSTALLED_BOOTIMAGE_TARGET),)
 ifneq ($(strip $(TARGET_NO_KERNEL)),true)
 ifneq ($(strip $(BOARD_KERNEL_BINARIES)),)
@@ -2456,6 +2457,7 @@
 
 endif # TARGET_NO_KERNEL
 endif # INSTALLED_BOOTIMAGE_TARGET
+endif # BUILDING_VENDOR_BOOT_IMAGE is not true
 
 ifeq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
 ifeq ($(BUILDING_RAMDISK_IMAGE),true)
@@ -2601,6 +2603,7 @@
 #
 # Note: it's intentional to skip signing for boot-test-harness.img, because it
 # can only be used if the device is unlocked with verification error.
+ifneq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
 ifneq ($(INSTALLED_BOOTIMAGE_TARGET),)
 ifneq ($(strip $(TARGET_NO_KERNEL)),true)
 
@@ -2643,6 +2646,7 @@
 
 endif # TARGET_NO_KERNEL
 endif # INSTALLED_BOOTIMAGE_TARGET
+endif # BUILDING_VENDOR_BOOT_IMAGE is not true
 endif # BOARD_BUILD_SYSTEM_ROOT_IMAGE is not true
 
 ifeq ($(BUILDING_VENDOR_BOOT_IMAGE),true)