Use product instead of oem for Product specific module

Bug: 64195575
Test: succeeded building product.img with BOARD_PRODUCTIMAGE_PARTITION_SIZE,
BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE and PRODUCT_PRODUCT_VERITY_PARTITION.
Change-Id: Icc4f8c16bc389fe20db680849f311d02df1299c3
diff --git a/android/variable.go b/android/variable.go
index 40fa45e..2c2a0cf 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -174,9 +174,9 @@
 	CFIExcludePaths *[]string `json:",omitempty"`
 	CFIIncludePaths *[]string `json:",omitempty"`
 
-	VendorPath *string `json:",omitempty"`
-	OdmPath    *string `json:",omitempty"`
-	OemPath    *string `json:",omitempty"`
+	VendorPath  *string `json:",omitempty"`
+	OdmPath     *string `json:",omitempty"`
+	ProductPath *string `json:",omitempty"`
 
 	ClangTidy  *bool   `json:",omitempty"`
 	TidyChecks *string `json:",omitempty"`