NetworkPkg: Fix DHCP TransmitReceive EFI_NO_MAPPING return in DnsDxe

NetworkPkg: Fix DHCP TransmitReceive EFI_NO_MAPPING return in DnsDxe

v2:
* Add Timeout check, if time out, return EFI_DEVICE_ERROR.

If the default station address is not available, TransmitReceive
function will return EFI_NO_MAPPING. DNS driver should handle this
case. This issue is caused by the r18201 fix.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Zhang Lubo <lubo.zhang@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: Lubo Zhang <lubo.zhang@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18248 6f19259b-4bc3-4df7-8a09-765794883524