kernel/wr_nic: several changes, some are printk only

- platform_data is now wrn_drvdata, fix accordingly

- include ../spec-nic.h to have wrn_drvdata available

- #if 0 irq requesting and other detatils

- some printk statements end other irrelevant stuff

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>