soong_config: Add TARGET_NEEDS_PLATFORM_TEXT_RELOCATIONS

* Soong product variable 'needs_text_relocations'

Change-Id: Ia22c94922f37c49f0d66a67747efa0ee97b4e477
Signed-off-by: Adrian DC <radian.dc@gmail.com>
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index 11569a3..c56c36b 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -1,6 +1,10 @@
 package android
 type Product_variables struct {
+	Needs_text_relocations struct {
+		Cppflags []string
+	}
 }
 
 type ProductVariables struct {
+	Needs_text_relocations  *bool `json:",omitempty"`
 }