ptp: Apply missing changes to support > 4GB transfers.

Not sure why, but these changes were dropped when the original
patchset was applied. The rest of the changes to ptp made it in.

Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Linus Walleij <triad@df.lth.se>
3 files changed