Add min_sdk_version to aidlCmd for droidstubs

JavaDoc's implementation of `aidlFlags` omits `min_sdk_version`, and
therefore aidl compiler would default it to a default version.

To fix this, pass the min_sdk_version explicitly

Bug: 253122520
Test: TH
Test: go test ./java
Change-Id: Ia8f639174f8361136596d0e7b3286606f84705cd
diff --git a/java/droiddoc.go b/java/droiddoc.go
index 2173dae..8a291ad 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -304,6 +304,9 @@
 		flags = append(flags, "-I"+src.String())
 	}
 
+	minSdkVersion := j.MinSdkVersion(ctx).ApiLevel.FinalOrFutureInt()
+	flags = append(flags, fmt.Sprintf("--min_sdk_version=%v", minSdkVersion))
+
 	return strings.Join(flags, " "), deps
 }