usbd: Do not join the thread pool

Change-Id: I99583b33001300aba3e2842fa8254ec505cac5ed
(cherry picked from commit 4db072a363327e493e8554c6eba843cb93a8d36d)
diff --git a/usbd/usbd.cpp b/usbd/usbd.cpp
index 41cd8dd..6ee77c7 100644
--- a/usbd/usbd.cpp
+++ b/usbd/usbd.cpp
@@ -22,15 +22,20 @@
 #include <android-base/properties.h>
 #include <android/hardware/usb/gadget/1.0/IUsbGadget.h>
 
+#include <hidl/HidlTransportSupport.h>
+
 #define PERSISTENT_USB_CONFIG "persist.sys.usb.config"
 
 using android::base::GetProperty;
 using android::base::SetProperty;
+using android::hardware::configureRpcThreadpool;
 using android::hardware::usb::gadget::V1_0::GadgetFunction;
 using android::hardware::usb::gadget::V1_0::IUsbGadget;
 using android::hardware::Return;
 
 int main(int /*argc*/, char** /*argv*/) {
+    configureRpcThreadpool(1, true);
+
     android::sp<IUsbGadget> gadget = IUsbGadget::getService();
     Return<void> ret;