hal clean up

- replace tusb_hal_int_enable/disable to dcd_int_enable/disable,
hcd_int_enable/disable
- remove tusb_hal_init(), this will be part of dcd_init/hcd_init,
anything beyond dcd/hcd should be inited by bsp

src/portable/nxp/lpc17_40/dcd_lpc17_40.c

@@ -202,6 +202,18 @@ bool dcd_init(uint8_t rhport)
   return TUSB_ERROR_NONE;
 }
 
+void dcd_int_enable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_EnableIRQ(USB_IRQn);
+}
+
+void dcd_int_disable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_DisableIRQ(USB_IRQn);
+}
+
 void dcd_set_address(uint8_t rhport, uint8_t dev_addr)
 {
   (void) rhport;

src/portable/nxp/lpc17_40/hal_lpc17_40.c

@@ -42,26 +42,6 @@
 
 #include "chip.h"
 
-void tusb_hal_int_enable(uint8_t rhport)
-{
-  (void) rhport;
-  NVIC_EnableIRQ(USB_IRQn);
-}
-
-void tusb_hal_int_disable(uint8_t rhport)
-{
-  (void) rhport;
-  NVIC_DisableIRQ(USB_IRQn);
-}
-
-//--------------------------------------------------------------------+
-// IMPLEMENTATION
-//--------------------------------------------------------------------+
-bool tusb_hal_init(void)
-{
-  return true;
-}
-
 void USB_IRQHandler(void)
 {
   extern void hal_dcd_isr(uint8_t rhport);