Rebuild wpa_supplicant.conf if the gen script is altered.

This change ensures that the wpa_supplicant.conf file will be rebuilt if the script
generating the config file is altered.

Change-Id: I628b98fc887a12355598306e6df35e725e1af8e3
(cherry picked from commit 907f92dde3e9d313d70fad0f8c72c5f764a7d169)
1 file changed