tools: add Broadcom cable modem firmware image creator

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36873 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: add support for BCM3368

Add support for the Broadcom BCM3368 cable modem chipset, includes:
- Ethernet
- SPI
- UARTs
- GPIOs
- PCI

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36874 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: add Broadcom cable modem firmware format header

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36875 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: add kernel space and image support for the Netgear CVG834G

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36876 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: add user-space support for Netgear CVG834G

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36877 3c298f89-4303-0410-b956-a3cf2f4a3e73