DwcEqosSnpDxe: Return proper status when link is down

Return EFI_NO_MEDIA instead of EFI_NOT_READY to avoid the long delays at
boot.

From DxeNetLib:
> If Aip protocol is supported by low layer drivers, three kinds of
> media states can be detected: EFI_SUCCESS, EFI_NOT_READY and
> EFI_NO_MEDIA, represents connected state, connecting state and no
> media state respectively. When function detects the current state is
> EFI_NOT_READY, it will loop to wait for next time's check until state
> turns to be EFI_SUCCESS or EFI_NO_MEDIA.

Signed-off-by: Mario Bălănică <[email protected]>

Author: mariobalanica

edk2-rockchip/Silicon/Synopsys/DesignWare/Drivers/DwcEqosSnpDxe/EqosUtil.c

@@ -1032,7 +1032,7 @@ EqosUpdateLink (
     Eqos->SnpMode.MediaPresent = LinkUp;
   }
 
-  return LinkUp ? EFI_SUCCESS : EFI_NOT_READY;
+  return LinkUp ? EFI_SUCCESS : EFI_NO_MEDIA;
 }
 
 EFI_STATUS