Move mainline_arm64 over to use mainline device

Possible now that it has TARGET_COPY_OUT set for vendor and
product.

Update the whitelist too.

Bug: 120974093
Test: make
Change-Id: I99eb718f5f4e79b9224a4079f2ff4595cd2b7ae2
diff --git a/target/product/mainline_arm64.mk b/target/product/mainline_arm64.mk
index c876636..cbc7f35 100644
--- a/target/product/mainline_arm64.mk
+++ b/target/product/mainline_arm64.mk
@@ -18,14 +18,12 @@
 $(call inherit-product, $(SRC_TARGET_DIR)/product/mainline.mk)
 
 PRODUCT_NAME := mainline_arm64
-PRODUCT_DEVICE := generic_arm64
+PRODUCT_DEVICE := mainline_arm64
 PRODUCT_BRAND := generic
 PRODUCT_SHIPPING_API_LEVEL := 28
 PRODUCT_RESTRICT_VENDOR_FILES := all
 
 PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := relaxed
-# Target device doesn't have a product partition, so whitelist the /system/ fallback path.
-PRODUCT_ARTIFACT_PATH_REQUIREMENT_WHITELIST := system/product/%
 PRODUCT_ARTIFACT_PATH_REQUIREMENT_WHITELIST += \
   root/init.zygote64_32.rc \
   system/etc/seccomp_policy/crash_dump.arm.policy \