bootstd: Add a test for the bootstd menu

Add a test which checks that two operating systems can be displayed in a
menu, allowing one to be selected.

Enable a few things on snow so that the unit tests build.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/snow_defconfig b/configs/snow_defconfig
index 6921c56..faa3a94 100644
--- a/configs/snow_defconfig
+++ b/configs/snow_defconfig
@@ -28,7 +28,11 @@
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x2050000
 CONFIG_FIT=y
 CONFIG_FIT_BEST_MATCH=y
+CONFIG_BOOTSTD_FULL=y
 CONFIG_SILENT_CONSOLE=y
+CONFIG_BLOBLIST=y
+# CONFIG_SPL_BLOBLIST is not set
+CONFIG_BLOBLIST_ADDR=0x43d00000
 # CONFIG_SPL_FRAMEWORK is not set
 CONFIG_SPL_FOOTPRINT_LIMIT=y
 CONFIG_SPL_MAX_FOOTPRINT=0x3800