[U-Boot] Need assistance with increasing command line size on Cavium

[Garrett Cooper]

Hello,
    Our group is running into command line length issues with a number
of Cavium boards we have at our office (CN38xx, CN5xxx), and I was
wondering (apart from the Linux kernel command line length), where I
would look to increase the size for the command line that's passed
from U-boot to the Linux kernel, as well as maybe which config file I
should be modifying to enact these changes.
Thanks,
-Garrett