[PATCH v2] USB: fsl_udc_core: use usb_endpoint_xfer_isoc to judge ISO XFER

[Li Yang-R58472]

> Subject: [PATCH v2] USB: fsl_udc_core: use usb_endpoint_xfer_isoc to judge ISO
> XFER
> 
> Some ISO gadgets, like audio, has SYNC attribute as well as
> USB_ENDPOINT_XFER_ISOC for their bmAttributes at ISO endpoint descriptor. So, it
> needs to use usb_endpoint_xfer_isoc to judge ISO XFER.
> 
> Signed-off-by: Peter Chen <peter.chen at freescale.com>

Acked-by: Li Yang <leoli at freescale.com>

- Leo