firmware: Remove a couple of questionable debug puts()

Those were low level debug meant to be temporary and somehow ended
up committed.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Ie1b802f347b0de9ea82edb61faaba6094b8f4dfa

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

@@ -165,8 +165,6 @@ void main()
 	/* SPI */
 	spi_init();
 
-	puts("XXX\n");
-
 	/* Enable USB directly */
 	serial_no_init();
 	usb_init(&app_stack_desc);

firmware/ice40-riscv/icE1usb/usb_e1.c

@@ -200,10 +200,6 @@ refill:
 		/* Next BDI */
 		bdi ^= 1;
 		usb_e1->out_bdi = bdi;
-
-		static int x = 0;
-		if ((x++ & 0xff) == 0xff)
-			puts(".");
 	}
 
 	/* Feedback endpoint */