arm: bcm235xx: implement the boot0 hook code

Choose the Kconfig boot0 hook option and implement the required code.

Signed-off-by: Steve Rae <srae@broadcom.com>
diff --git a/arch/arm/include/asm/arch-bcm235xx/boot0.h b/arch/arm/include/asm/arch-bcm235xx/boot0.h
new file mode 100644
index 0000000..7e72882
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm235xx/boot0.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2016 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __BOOT0_H
+#define __BOOT0_H
+
+/* BOOT0 header information */
+#define ARM_SOC_BOOT0_HOOK	\
+	.word	0xbabeface;	\
+	.word	_end - _start
+
+#endif /* __BOOT0_H */