ext: simplelink: host driver: depend on multithreading

We need multithreading support for the host driver to function.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

ext/hal/ti/simplelink/Kconfig

@@ -8,6 +8,7 @@ config SIMPLELINK_HOST_DRIVER
 	bool "Build the SimpleLink WiFi Host Driver"
 	default n
 	depends on HAS_CC3220SDK
+	depends on MULTITHREADING
 	select NEWLIB_LIBC
 	help
 	Build the SimpleLink host driver