Repair corner cases in nios2 PLT and GP handling. See the patches
themselves for extensive detailed explanation.
The patches don't contain the ChangeLog entries, since the changelog
entries often cause trouble when applying the patch.
Signed-off-by: Marek Vasut <marex@denx.de> Cc: Ross Burton <ross.burton@intel.com> Cc: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Ross Burton <ross.burton@intel.com>
