Add support for loading U-Boot on the Broadcom 7445 SoC. This port
assumes Broadcom's BOLT bootloader is acting as the second stage
bootloader, and U-Boot is acting as the third stage bootloader, loaded
as an ELF program by BOLT.
Signed-off-by: Thomas Fitzsimmons <email@example.com>
Cc: Stefan Roese <firstname.lastname@example.org>
Cc: Tom Rini <email@example.com>
Cc: Florian Fainelli <firstname.lastname@example.org>