update nrf52 hal millis

tinyusb/portable/nordic/nrf5x/hal_nrf5x.c

@@ -56,13 +56,6 @@
 /* FUNCTION DECLARATION
  *------------------------------------------------------------------*/
 
-volatile uint32_t system_ticks = 0;
-
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
 
 bool tusb_hal_init(void)
 {
@@ -81,12 +74,4 @@ void tusb_hal_int_disable(uint8_t rhport)
   NVIC_DisableIRQ(USBD_IRQn);
 }
 
-uint32_t tusb_hal_millis(void)
-{
-  //#define tick2ms(tck)         ( ( ((uint64_t)(tck)) * 1000) / configTICK_RATE_HZ )
-  //return tick2ms( app_timer_cnt_get() );
-
-  return system_ticks;
-}
-
 #endif