rename nxp_sof_received to nxp_int_sof

implementing freeRTOS integration
change get_period_frame_list from using lst_idx to hostid (fix bug)
adding polling interval supported for interrupt: 1ms, 2ms, 4ms, 8ms
- add interval_ms to get_period_head function
- add bInterval to qhd_init
- add support for sub-frame (less than 8 micro frames) interval
- add bunch of test for interrupt different intervals

tests/test/support/ehci_controller.c

@@ -123,7 +123,7 @@ void ehci_controller_run(uint8_t hostid)
   complete_all_qtd_in_list((ehci_qhd_t*) regs->async_list_base);
 
   //------------- Period List -------------//
-  complete_all_qtd_in_list( get_period_head(hostid) );
+  complete_all_qtd_in_list( get_period_head(hostid, 1) );
   regs->usb_sts = EHCI_INT_MASK_NXP_ASYNC | EHCI_INT_MASK_NXP_PERIODIC;
 
   hcd_isr(hostid);