test: unit test for exception command

Test that an exception SIGILL is answered by a reset on the sandbox if
CONFIG_SANDBOX_CRASH_RESET=y or by exiting to the OS otherwise.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index 356193f..e8f9a9e 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -112,6 +112,7 @@
 	imply BITREVERSE
 	select BLOBLIST
 	imply CMD_DM
+	imply CMD_EXCEPTION
 	imply CMD_GETTIME
 	imply CMD_HASH
 	imply CMD_IO