Restore "Linktype check for native:product"

Similar to native:vendor, native:product can use VNDK libs but not
vndk_private.
It is activated when PRODUCT_PRODUCT_VNDK_VERSION is set.

This restores the reverted commit
4e7e76fe5a19996ad02f7260ef81c780b41f1a99 (aosp/1197274).
The problem of the original CL was assuming no modules have both
LOCAL_PRODUCT_MODULE and LOCAL_USE_VNDK in the old implementations.
But many vendor modules in the targets without setting
PRODUCT_PRODUCT_VNDK_VERSION in old branches had both flags that
caused link failures.
To make it no-op without PRODUCT_PRODUCT_VNDK_VERSION, I defined
LOCAL_USE_VNDK_PRODUCT that is set to true if
PRODUCT_PRODUCT_VNDK_VERSION is defined and LOCAL_PRODUCT_MODULE is
true.

Bug: 146620523
Test: build with PRODUCT_PRODUCT_VNDK_VERSION := current
Change-Id: I344c7dc1c47f08706c101e486ff07c3f10aff8ac
diff --git a/core/local_vndk.mk b/core/local_vndk.mk
index 198e361..b1bd3e6 100644
--- a/core/local_vndk.mk
+++ b/core/local_vndk.mk
@@ -1,5 +1,5 @@
 
-#Set LOCAL_USE_VNDK for modules going into vendor or odm partition, except for host modules
+#Set LOCAL_USE_VNDK for modules going into product, vendor or odm partition, except for host modules
 #If LOCAL_SDK_VERSION is set, thats a more restrictive set, so they dont need LOCAL_USE_VNDK
 ifndef LOCAL_IS_HOST_MODULE
 ifndef LOCAL_SDK_VERSION
@@ -8,6 +8,13 @@
     # Note: no need to check LOCAL_MODULE_PATH* since LOCAL_[VENDOR|ODM|OEM]_MODULE is already
     # set correctly before this is included.
   endif
+  ifdef PRODUCT_PRODUCT_VNDK_VERSION
+    # Product modules also use VNDK when PRODUCT_PRODUCT_VNDK_VERSION is defined.
+    ifeq (true,$(LOCAL_PRODUCT_MODULE))
+      LOCAL_USE_VNDK:=true
+      LOCAL_USE_VNDK_PRODUCT:=true
+    endif
+  endif
 endif
 endif
 
@@ -33,6 +40,7 @@
   # If we're not using the VNDK, drop all restrictions
   ifndef BOARD_VNDK_VERSION
     LOCAL_USE_VNDK:=
+    LOCAL_USE_VNDK_PRODUCT:=
   endif
 endif