Silicon/SynQuacer/NetsecDxe: drop false dependency on device path protocol

The device path protocol is no longer installed by the NetSec driver,
but by the platform driver. So drop it from the .INF.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>