sandbox: provide /chosen/boot-hartid property

On RISC-V the sandbox must provide the /chosen/boot-hartid in the
devicetree.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/arch/sandbox/lib/Makefile b/arch/sandbox/lib/Makefile
index b4ff717..a2bc5a7 100644
--- a/arch/sandbox/lib/Makefile
+++ b/arch/sandbox/lib/Makefile
@@ -5,7 +5,7 @@
 # (C) Copyright 2002-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
-obj-y	+= interrupts.o sections.o
+obj-y	+= fdt_fixup.o interrupts.o sections.o
 obj-$(CONFIG_PCI)	+= pci_io.o
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-$(CONFIG_CMD_BOOTZ) += bootm.o