Add imx93-var-som support

Add support for the Variscite VAR-SOM-IMX93 evaluation kit. The SoM
consists of an NXP iMX93 dual A55 CPU. The SoM is mounted on a Variscite
Symphony SBC.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
diff --git a/board/variscite/common/eth.h b/board/variscite/common/eth.h
new file mode 100644
index 0000000..a335c08
--- /dev/null
+++ b/board/variscite/common/eth.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2023 Variscite Ltd.
+ *
+ */
+
+#ifndef _MX9_ETH_H_
+#define _MX9_ETH_H_
+
+int var_setup_mac(struct var_eeprom *eeprom);
+
+#endif /* _MX9_ETH_H_ */