staging: hv: remove the carrier status check from netvsc_open()

Checking carrier status in netvsc_open() is not necessary.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>