sandbox: Renamed sb command to host

As suggested by Simon Glass, rename the sb command to host but keep the
old sb command as an alias

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Makefile b/common/Makefile
index 252fbf1..978c33b 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -152,7 +152,7 @@
 obj-$(CONFIG_CMD_READ) += cmd_read.o
 obj-$(CONFIG_CMD_REGINFO) += cmd_reginfo.o
 obj-$(CONFIG_CMD_REISER) += cmd_reiser.o
-obj-$(CONFIG_SANDBOX) += cmd_sandbox.o
+obj-$(CONFIG_SANDBOX) += cmd_host.o
 obj-$(CONFIG_CMD_SATA) += cmd_sata.o
 obj-$(CONFIG_CMD_SF) += cmd_sf.o
 obj-$(CONFIG_CMD_SCSI) += cmd_scsi.o