change dcd_init() return from void to bool

src/portable/nxp/khci/dcd_khci.c

@@ -265,7 +265,7 @@ static void process_bus_resume(uint8_t rhport)
 /*------------------------------------------------------------------*/
 /* Device API
  *------------------------------------------------------------------*/
-void dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
+bool dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
   (void) rhport;
   (void) rh_init;
 
@@ -294,6 +294,8 @@ void dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
 
   dcd_connect(rhport);
   NVIC_ClearPendingIRQ(USB0_IRQn);
+
+  return true;
 }
 
 void dcd_int_enable(uint8_t rhport)

src/portable/nxp/lpc17_40/dcd_lpc17_40.c

@@ -167,7 +167,7 @@ static void bus_reset(void)
   tu_memclr(&_dcd, sizeof(dcd_data_t));
 }
 
-void dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
+bool dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
   (void) rhport;
   (void) rh_init;
 
@@ -186,6 +186,8 @@ void dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
 
   // Clear pending IRQ
   NVIC_ClearPendingIRQ(USB_IRQn);
+
+  return true;
 }
 
 void dcd_int_enable(uint8_t rhport)

src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c

@@ -289,7 +289,7 @@ static void edpt_reset_all(uint8_t rhport)
   }
   prepare_setup_packet(rhport);
 }
-void dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
+bool dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
   (void) rh_init;
   edpt_reset_all(rhport);
 
@@ -303,6 +303,8 @@ void dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
                            DEVCMDSTAT_RESET_CHANGE_MASK | DEVCMDSTAT_CONNECT_CHANGE_MASK | DEVCMDSTAT_SUSPEND_CHANGE_MASK;
 
   NVIC_ClearPendingIRQ(_dcd_controller[rhport].irqnum);
+
+  return true;
 }
 
 void dcd_int_enable(uint8_t rhport)