brcm63xx: fix image generation

This fixes build issues introduced on r43361.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43376 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: move rsa signature to additional options

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43377 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: unify dt image generation

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43378 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: uci-defaults: network: move DSL-274x1 F1 to right section

The cpu port is at 8, not 5.

Fixes #18406.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43379 3c298f89-4303-0410-b956-a3cf2f4a3e73