Revert "Revert "Add prebuilt bootloader var and add bootloader t..."

Revert submission 1411608-revert-1402265-cf-x86-bootloader-XGKLNEQAPF

Reason for revert: Breakage originally caused by change was fixed. Refer to tracking bug for details.
Reverted Changes:
I89e95d4a6:Revert "Add prebuilt bootloader var and add bootlo...
I8fe199351:Revert "Added bootloader binary to cf x86 based ta...

Bug: 166380489
Bug: 164917252
Test: local build and Treehugger build
Change-Id: Ia895aedd77f2ec825aefecaf74c6dfc1ce631c93
diff --git a/core/Makefile b/core/Makefile
index 92723d3..d84f8c0 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -584,6 +584,10 @@
 # #################################################################
 ifneq ($(strip $(TARGET_NO_BOOTLOADER)),true)
   INSTALLED_BOOTLOADER_MODULE := $(PRODUCT_OUT)/bootloader
+  ifdef BOARD_PREBUILT_BOOTLOADER
+    $(eval $(call copy-one-file,$(BOARD_PREBUILT_BOOTLOADER),$(INSTALLED_BOOTLOADER_MODULE)))
+    $(call dist-for-goals,dist_files,$(INSTALLED_BOOTLOADER_MODULE))
+  endif # BOARD_PREBUILT_BOOTLOADER
   ifeq ($(strip $(TARGET_BOOTLOADER_IS_2ND)),true)
     INSTALLED_2NDBOOTLOADER_TARGET := $(PRODUCT_OUT)/2ndbootloader
   else
@@ -4138,6 +4142,9 @@
 ifdef DEVICE_MANIFEST_FILE
 	$(hide) echo "vintf_include_empty_vendor_sku=true" >> $@
 endif
+ifeq ($(BOARD_BOOTLOADER_IN_UPDATE_PACKAGE),true)
+	$(hide) echo "bootloader_in_update_package=true" >> $@
+endif
 
 .PHONY: misc_info
 misc_info: $(INSTALLED_MISC_INFO_TARGET)
@@ -4294,6 +4301,10 @@
 $(BUILT_TARGET_FILES_PACKAGE): $(MK_VBMETA_BOOT_KERNEL_CMDLINE_SH)
 endif
 
+ifdef BOARD_PREBUILT_BOOTLOADER
+$(BUILT_TARGET_FILES_PACKAGE): $(INSTALLED_BOOTLOADER_MODULE)
+endif
+
 # Depending on the various images guarantees that the underlying
 # directories are up-to-date.
 $(BUILT_TARGET_FILES_PACKAGE): \
@@ -4583,6 +4594,10 @@
 	$(hide) mkdir -p $(zip_root)/PREBUILT_IMAGES
 	$(hide) cp $(INSTALLED_DTBOIMAGE_TARGET) $(zip_root)/PREBUILT_IMAGES/
 endif # BOARD_PREBUILT_DTBOIMAGE
+ifdef BOARD_PREBUILT_BOOTLOADER
+	$(hide) mkdir -p $(zip_root)/IMAGES
+	$(hide) cp $(INSTALLED_BOOTLOADER_MODULE) $(zip_root)/IMAGES/
+endif
 ifneq ($(strip $(BOARD_CUSTOMIMAGES_PARTITION_LIST)),)
 	$(hide) mkdir -p $(zip_root)/PREBUILT_IMAGES
 	$(hide) $(foreach partition,$(BOARD_CUSTOMIMAGES_PARTITION_LIST), \
diff --git a/core/board_config.mk b/core/board_config.mk
index b7d0178..adef055 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -20,6 +20,7 @@
 # ###############################################################
 
 _board_strip_readonly_list := \
+  BOARD_BOOTLOADER_IN_UPDATE_PACKAGE \
   BOARD_EGL_CFG \
   BOARD_HAVE_BLUETOOTH \
   BOARD_INSTALLER_CMDLINE \