octeontx2-pf: cancel reset_task work

During driver exit cancel the queued
reset_task work in VF driver.

Fixes: 3184fb5b

 ("octeontx2-vf: Virtual function driver support")
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>