dcd_nrf5x: Fix dcd_edpt_open for iso endpoint

When ISO endpoint handling was introduced two lines that
clear stall and data toggle bit were left unchanged and they
were effective for ISO enadpoint as well.
This is incorrect behavior since EPSTALL and DTOGGLE registers
have only 3 bits for address.
Leaving code that clears toggle bit results in endpoint 0 toggle bit
being reset when iso endpoint (8) is opened.

Now code that clears stall and toggle bit is applied to non-iso endpoint only
as it was done before iso handling was introduced.

Author: kasjer

src/portable/nordic/nrf5x/dcd_nrf5x.c

@@ -340,6 +340,9 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
       NRF_USBD->INTENSET = TU_BIT(USBD_INTEN_ENDEPIN0_Pos + epnum);
       NRF_USBD->EPINEN  |= TU_BIT(epnum);
     }
+    // clear stall and reset DataToggle
+    NRF_USBD->EPSTALL = (USBD_EPSTALL_STALL_UnStall << USBD_EPSTALL_STALL_Pos) | ep_addr;
+    NRF_USBD->DTOGGLE = (USBD_DTOGGLE_VALUE_Data0 << USBD_DTOGGLE_VALUE_Pos) | ep_addr;
   }
   else
   {
@@ -375,10 +378,6 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
     }
   }
 
-  // clear stall and reset DataToggle
-  NRF_USBD->EPSTALL = (USBD_EPSTALL_STALL_UnStall << USBD_EPSTALL_STALL_Pos) | ep_addr;
-  NRF_USBD->DTOGGLE = (USBD_DTOGGLE_VALUE_Data0 << USBD_DTOGGLE_VALUE_Pos) | ep_addr;
-
   __ISB(); __DSB();
 
   return true;