maintainers: update for netvsc
maintainers: update for netvsc

Add Long Li as additional maintainer.

Signed-off-by: Long Li <7c3f1736f0d21e1e8ded3a98dcacf1239706b2af@microsoft.com>
Acked-by: Haiyang Zhang <6c26c5044f1d67d9ed5db6596adb36d25510e216@microsoft.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk