Currently the malta board is loading the initrd just after the kernel.
This doesn't work for kaslr enabled kernels, as the initrd ends-up being
overwritten.

Move the initrd at the end of the low memory, that should leave a
sufficient gap for kaslr.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Tested-by: NYongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: NYongbok Kim <yongbok.kim@imgtec.com>