HV: add generic board config

hypervisor/arch/x86/configs/($CONFIG_BOARD) will store Board specific configs,
add a generic folder to store configs for generic boards that they can share
one build binary with minimal and common features in some scenarios like SDC.

Please be aware that BDF of pci devices are different on each board, so one
binary for LOGICAL_PARTITION scenario is not supported.

Tracked-On: #2291

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/arch/x86/configs/generic/board.c

@@ -0,0 +1,10 @@
+/*
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <board.h>
+
+struct platform_clos_info platform_clos_array[0];
+uint16_t platform_clos_num = 0;