Support multiple rsp files in REParams

rewrapper supports a comma separate list of rsp files, replace
REParams.RSPFile with REParmas.RSPFiles.

Test: remoteexec_test.go
Change-Id: I7850c071c23d368d6fad4480dd527d146c13c6d3
diff --git a/java/droiddoc.go b/java/droiddoc.go
index a892b36..34f017d 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -1231,7 +1231,7 @@
 			Labels:               labels,
 			ExecStrategy:         execStrategy,
 			Inputs:               inputs,
-			RSPFile:              implicitsRsp.String(),
+			RSPFiles:             []string{implicitsRsp.String()},
 			ToolchainInputs:      []string{config.JavaCmd(ctx).String()},
 			Platform:             map[string]string{remoteexec.PoolKey: pool},
 			EnvironmentVariables: []string{"ANDROID_SDK_HOME"},