Fixes to avoid problems when the driver shares an interrupt. These were
caused because the ISR cannot determine the status of the chip without
changing its state and the driver was only disabling the interrupts from
the card during some critical regions. An interrupt originating from
another device at the wrong moment could run the ISR and corrupt chip
state. Fixed by blocking interupts in the processor in critical regions
and never checking the chip interrupt status before the driver is fully
up.


Added the ability to override the Regulatory Domain stored in ROM. The
following command achieves this

iwpriv <interface> regdomain <domain>

vaild domains are USA,Canada,Europe,Spain,France,MKK,MKK1,Israel

The current regulatory domain affects which radio channels are available
for use.


Some minor tidying to calibrate busy-wait loops using udelay and remove
inclusion of obsolete include/linux/802_11.h