octeontx2-pf: Send UP messages to VF only when VF is up.

commit b0e1d72abfff026f460a74770be4d2496edb5313 from
git@git.assembla.com:cavium/WindRiver.linux.git

When PF sending link status messages to VF, it is possible
that by the time link_event_task work function is executed
VF might have brought down. Hence before sending VF link
status message check whether VF is up to receive it.

Change-Id: I0e94847b4e16029b2bace87861230729cf0ad230
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/121052
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>