arm64: versal-net: Add support for Versal NET platform

Versal NET platform is based on Versal chip which is reusing a lot of IPs.
For more information about new IPs please take a look at DT which describe
currently supported devices.
The patch is adding architecture and board support with soc detection
algorithm. Generic setting should be very similar to Versal but it will
likely diverge in longer run.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/320206853dc370ce290a4e7b6d0bb26b05206021.1663589964.git.michal.simek@amd.com

arch/arm/mach-versal-net/include/mach/hardware.h

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2016 - 2022, Xilinx, Inc.
+ * Copyright (C) 2022, Advanced Micro Devices, Inc.
+ */
+
+#ifndef __ASSEMBLY__
+#include <linux/bitops.h>
+#endif
+
+#define PMC_TAP	0xF11A0000
+
+#define PMC_TAP_IDCODE		(PMC_TAP + 0)
+#define PMC_TAP_VERSION		(PMC_TAP + 0x4)
+# define PMC_VERSION_MASK	GENMASK(7, 0)
+# define PS_VERSION_MASK	GENMASK(15, 8)
+# define RTL_VERSION_MASK	GENMASK(23, 16)
+# define PLATFORM_MASK		GENMASK(27, 24)
+# define PLATFORM_VERSION_MASK	GENMASK(31, 28)
+#define PMC_TAP_USERCODE	(PMC_TAP + 0x8)
+
+enum versal_net_platform {
+	VERSAL_NET_SILICON = 0,
+	VERSAL_NET_SPP = 1,
+	VERSAL_NET_EMU = 2,
+	VERSAL_NET_QEMU = 3,
+};