NetworkPkg/IScsiDxe: Add IPv6 support condition check.

Base on the request of https://bugzilla.tianocore.org/show_bug.cgi?id=710,
we provide this patch to IPv6 condition check by leveraging AIP Protocol.

Cc: Karunakar P <karunakarp@amiindia.co.in>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Karunakar P <karunakarp@amiindia.co.in>
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Karunakar p <karunakarp@amiindia.co.in>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>

NetworkPkg/IScsiDxe/IScsiMisc.h

@@ -217,6 +217,7 @@ IScsiGenRandom (
   Record the NIC information in a global structure.
 
   @param[in]  Controller         The handle of the controller.
+  @param[in]  Image              Handle of the image.
 
   @retval EFI_SUCCESS            The operation is completed.
   @retval EFI_OUT_OF_RESOURCES   Do not have sufficient resource to finish this
@@ -225,7 +226,8 @@ IScsiGenRandom (
 **/
 EFI_STATUS
 IScsiAddNic (
-  IN EFI_HANDLE  Controller
+  IN EFI_HANDLE  Controller,
+  IN EFI_HANDLE  Image
   );
 
 /**