Revert r475122, r475123 and r475124.

To manage upstream, we use the exact patches we've submitted upstream
via their patchwork server. This deviates a little from a standard
port, but it's what we do with all the other u-boot ports and isn't
grossly out of line (many other ports pull patches during the build).
We do it this way because the standard way was an unmanageable
nightmare and resulted in divergence of u-boot ports.

Approved by: uboot@ (maintainer of these ports)
Differential Revision: https://reviews.freebsd.org/D16397