hikey960/hikey: Re-transition to using to vendor-package

Moves the bootloader objects, and mali libraries to the vendor
package and adds the support files, tweaking the flash-all.sh
script

Will use the vendor-package located here:
  https://releases.linaro.org/android/aosp-linaro-vendor-package/extract-linaro_devices-20220210.tgz

Previously this patch was reverted, as there would be build
errors when the vendor pacakge was missing.

This patch re-applies the earlier change, with some additional
fixes to ensure we don't see build trouble when the package is
missing.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I53ec5516d91391c0d3f18c801e730eff150076af
diff --git a/Android.mk b/Android.mk
index 41d191f..179188a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -24,6 +24,19 @@
 
 LOCAL_PATH := $(call my-dir)
 
+
+ifeq (,$(wildcard $(LINARO_VENDOR_PATH)/hikey960/$(EXPECTED_LINARO_VENDOR_VERSION)/version.mk))
+droidcore: $(PRODUCT_OUT)/missing_vendor_package
+$(PRODUCT_OUT)/missing_vendor_package:
+	echo
+	echo "Missing Linaro Vendor Package!"
+	echo "Please download new binaries here:"
+	echo "  $(VND_PKG_URL)"
+	echo "And extract in the ANDROID_TOP_DIR"
+	echo
+	false
+endif
+
 $(eval $(call declare-1p-copy-files,device/linaro/hikey,.conf))
 $(eval $(call declare-1p-copy-files,device/linaro/hikey,.img))
 $(eval $(call declare-1p-copy-files,device/linaro/hikey,.kl))