compat: use EXPORT_SYMBOL_GPL()

compat: use EXPORT_SYMBOL_GPL()

This was the intent all along, however some symbols have
slipped. The goal is always clear: if you are using any
of this code at run time this is making your code derivative
works of the Linux kernel and therefore GPLv2.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>