test/cmd: Move wget test to under a sandbox guard

This test is sandbox-centric, so guard it so.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/test/cmd/Makefile b/test/cmd/Makefile
index 478ef4c..8f21349 100644
--- a/test/cmd/Makefile
+++ b/test/cmd/Makefile
@@ -30,7 +30,7 @@
 obj-$(CONFIG_CMD_MBR) += mbr.o
 obj-$(CONFIG_CMD_READ) += rw.o
 obj-$(CONFIG_CMD_SETEXPR) += setexpr.o
+obj-$(CONFIG_CMD_WGET) += wget.o
 obj-$(CONFIG_ARM_FFA_TRANSPORT) += armffa.o
 endif
 obj-$(CONFIG_CMD_TEMPERATURE) += temperature.o
-obj-$(CONFIG_CMD_WGET) += wget.o