zik <jeff@garzik.org> 1165036320 -0500

e1000: add dynamic generic MSI interrupt routine

Add a generic MSI interrupt routine that is IO read-free, speeding up
MSI interrupt handling.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>