payloads: Drop unneeded empty lines

Change-Id: I6faeb7c783052edc4217d2d301dbb905e1fc6a19
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

payloads/libpayload/drivers/usb/xhci_private.h

@@ -515,7 +515,6 @@ static inline int xhci_ep_id(const endpoint_t *const ep) {
 	return ((ep->endpoint & 0x7f) * 2) + (ep->direction != OUT);
 }
 
-
 #ifdef XHCI_DUMPS
 void xhci_dump_slotctx(const slotctx_t *);
 void xhci_dump_epctx(const epctx_t *);