icE1usb fw: Don't prefill feedback

This prevents inlining of the code, and is completely
unecessary.

 (1) It will be filled a bit later
 (2) We don't have any meaningful feedback to provide anyway

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: I6e97bc79d1fe50950bb1f7cd71d8c428e928d4ae
diff --git a/firmware/ice40-riscv/icE1usb/usb_e1.c b/firmware/ice40-riscv/icE1usb/usb_e1.c
index a18ebe4..032eec8 100644
--- a/firmware/ice40-riscv/icE1usb/usb_e1.c
+++ b/firmware/ice40-riscv/icE1usb/usb_e1.c
@@ -323,9 +323,6 @@
 		ep_regs->bd[0].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN(292);
 		ep_regs->bd[1].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN(292);
 
-		/* EP Feedback: Pre-fill */
-		_usb_fill_feedback_ep(port);
-
 		break;
 	}