fw/ice40-riscv: Remove usb_ep_boot manual declaration

It's now properly declared in the stack header

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Id2fd50c04a8d8781ad8b94e12ba9f469777482d1

firmware/ice40-riscv/e1-tracer/usb_e1.c

@@ -28,9 +28,6 @@ unsigned int e1_rx_level(int chan);
 uint8_t e1_get_pending_flags(int chan);
 /* ---- */
 
-bool
-usb_ep_boot(const struct usb_intf_desc *intf, uint8_t ep_addr, bool dual_bd);
-
 
 void
 usb_e1_run(void)

firmware/ice40-riscv/icE1usb/usb_e1.c

@@ -48,9 +48,6 @@ unsigned int e1_tx_level(void);
 unsigned int e1_rx_level(void);
 /* ---- */
 
-bool
-usb_ep_boot(const struct usb_intf_desc *intf, uint8_t ep_addr, bool dual_bd);
-
 static void
 _usb_fill_feedback_ep(void)
 {