am335x, guardian: Add support for the bosch guardian board

Add support for the Bosch Guardian board.

CPU  : AM335X-GP rev 2.1
Model: Bosch AM335x Guardian
I2C:   ready
DRAM:  256 MiB
NAND:  512 MiB
MMC:   OMAP SD/MMC: 0

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Felix Brack <fb@ltec.ch>
diff --git a/board/bosch/guardian/board.h b/board/bosch/guardian/board.h
new file mode 100644
index 0000000..b301caf
--- /dev/null
+++ b/board/bosch/guardian/board.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * board.h
+ *
+ * Board header for Bosch Guardian
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ * Copyright (C) 2018 Robert Bosch Power Tools GmbH
+ */
+
+#ifndef _BOARD_H_
+#define _BOARD_H_
+
+void enable_uart0_pin_mux(void);
+void enable_i2c0_pin_mux(void);
+void enable_board_pin_mux(void);
+#endif