Revert "net: vertexcom: default to disabled on kbuild"

This reverts commit 6bf950a8.

To align with other vendors, NET_VENDOR configs are supposed to be ON by
default, while their drivers should default to OFF.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20220110205246.66298-1-saeed@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>