dfu: Increase DFU buffer size from 4MiB to 8MiB

Increase size of DMA buffer from 4MiB to 8MiB. This is necessary due to
uImage size increase.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
1 file changed