uboot-phytec

board: ls1046a: enable dhcp boot

dhcp boot is a useful feature and works out-of-the-box on these
platforms. Enable it as a boot source.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>