arm64: zynqmp: Print multiboot register value in EL3

Multi boot register can be used for using different boot images and design
better boot strategy. Let EL3 SPL or U-Boot to read it and print it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-zynqmp/include/mach/hardware.h b/arch/arm/mach-zynqmp/include/mach/hardware.h
index fd361c5..a0acfa2 100644
--- a/arch/arm/mach-zynqmp/include/mach/hardware.h
+++ b/arch/arm/mach-zynqmp/include/mach/hardware.h
@@ -128,7 +128,9 @@
 #define ZYNQMP_SILICON_VER_SHIFT	12
 
 struct csu_regs {
-	u32 reserved0[17];
+	u32 reserved0[4];
+	u32 multi_boot;
+	u32 reserved1[12];
 	u32 version;
 };