net-snk: Remove some unused PCI functions

The read/write_io ones are used by biosemu, though we should
probably fix them to work on qemu platform at some stage.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
net-snk: Remove unused timer functions

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
net-snk: Remove redundant prototypes

Those functions are in string.h

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
net-snk: Remove printk() in favor of printf()

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>