Enforce hidden apis usage in product(soong)

Only if PRODUCT_ENFORCE_PRODUCT_PARTITION_INTERFACE is set,
every app and java library in product cannot use hidden APIs anymore.

checkSdkVersion() checks if sdk_version of app and library is narrow enough,
checkLinkType() checks every library that app links agianst

Bug: 132780927
Test: m
Test: set PRODUCT_ENFORCE_PRODUCT_PARTITION_INTERFACE, and check whether build
error occurs.
Change-Id: Ic630503b875040f730feda4fef826ed6d71da111
diff --git a/android/variable.go b/android/variable.go
index abbdf21..25a5dc0 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -309,6 +309,8 @@
 	TargetFSConfigGen []string `json:",omitempty"`
 
 	MissingUsesLibraries []string `json:",omitempty"`
+
+	EnforceProductPartitionInterface *bool `json:",omitempty"`
 }
 
 func boolPtr(v bool) *bool {