In some systems, it is possible that the BIOS may have enabled interrupt coalescing
for the Marvell controllers which support it.  This patch adds code to detect/ack
interrupts from the chip's coalescing (combing) logic.
Signed-off-by: NMark Lord <liml@rtr.ca>
Signed-off-by: NJeff Garzik <jeff@garzik.org>