Propagate PRODUCT_MINIMIZE_JAVA_DEBUG_INFO to soong and use it

Strip debug info in javac when PRODUCT_MINIMIZE_JAVA_DEBUG_INFO
is set.

Test: m with PRODUCT_MINIMIZE_JAVA_DEBUG_INFO=true
Change-Id: I167e742662801291c516bf1ff826486560d22147
diff --git a/android/variable.go b/android/variable.go
index 4b3925c..28841e2 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -158,6 +158,7 @@
 	Treble                     *bool `json:",omitempty"`
 	Pdk                        *bool `json:",omitempty"`
 	Uml                        *bool `json:",omitempty"`
+	MinimizeJavaDebugInfo      *bool `json:",omitempty"`
 
 	IntegerOverflowExcludePaths *[]string `json:",omitempty"`