Without this change the barebox.bin ends up with:

00000000  79 ba 8f 79 00 00 00 00  75 39 6e d1 74 27 00 00  |y..y....u9n.t'..|
00000010  01 00 00 00 00 00 00 00  28 80 ad db 8d c7 a8 67  |........(......g|
00000020  4e 07 00 00 10 00 00 00  2f 63 6f 6e 66 69 67 00  |N......./config.|
00000030  8d c7 a8 68 ff 01 00 00  23 21 2f 62 69 6e 2f 73  |...h....#!/bin/s|
00000040  68 0a 0a 68 6f 73 74 6e  61 6d 65 3d 46 49 58 4d  |h..hostname=FIXM|
00000050  45 0a 69 66 20 5b 20 2d  7a 20 22 24 75 73 65 72  |E.if [ -z "$user|
00000060  22 20 5d 3b 20 74 68 65  6e 0a 23 09 75 73 65 72  |" ]; then.#.user|
00000070  3d 0a 66 69 0a 0a 23 20  45 6e 74 65 72 20 4d 41  |=.fi..# Enter MA|
[...]

which means it starts with the default environment instead of the reset vector area.

Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>