Ensure config file for wpa_supplicant exists

Add ensuring the configuration file for wpa_supplicant hidl 1.0.
When initializing hidl service, supplicant will copy the
template configuration file if the configuration file is not exist.

Bug: 74504608
Test: Wi-Fi is successfully turned on.
Change-Id: I1c62ecf898445d2ddfb1efd26b2b0862e5ff87ff
Merged-In: I1c62ecf898445d2ddfb1efd26b2b0862e5ff87ff
(cherry picked from commit f5ff1e139e718d9c76edc2d8a11807936778ad97)
3 files changed