drivers: nand: brcmnand: add initial support

The driver brcmnand come from linux kernel 4.18.
Only SoC bcm6838 and bcm6858 are supported.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand_compat.h b/drivers/mtd/nand/raw/brcmnand/brcmnand_compat.h
new file mode 100644
index 0000000..02cab0f
--- /dev/null
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand_compat.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef __BRCMNAND_COMPAT_H
+#define __BRCMNAND_COMPAT_H
+
+#include <clk.h>
+#include <dm.h>
+
+struct clk *devm_clk_get(struct udevice *dev, const char *id);
+int clk_prepare_enable(struct clk *clk);
+void clk_disable_unprepare(struct clk *clk);
+
+char *devm_kasprintf(struct udevice *dev, gfp_t gfp, const char *fmt, ...);
+
+#endif /* __BRCMNAND_COMPAT_H */