ShellPkg: Get media status in ifconfig command

ShellPkg: Get media status in ifconfig command

v2:
* Update to use NetLibDetectMedia() directly.

This patch is used to get media status in ifconfig command.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18363 6f19259b-4bc3-4df7-8a09-765794883524