kmp204x: do not make FPGA config error fail board_early_init_r

This prevents the board from booting which is not the expected behavior.
Signed-off-by: NValentin Longchamp <valentin.longchamp@ch.abb.com>
Signed-off-by: NHolger Brunck <holger.brunck@ch.abb.com>
CC: Priyanka Jain <priyanka.jain@nxp.com>

board/keymile/kmp204x/kmp204x.c

@@ -138,7 +138,7 @@ int board_early_init_r(void)
 	/* enable Application Buffer */
 	qrio_enable_app_buffer();
 
-	return ret;
+	return 0;
 }
 
 unsigned long get_board_sys_clk(unsigned long dummy)