In hostapd, there have hostapd.android.rc and make /data/vendor/wifi
with permission 770 when the device boots up.
It will overwrite the permission from slider specific rc,
which makes this folder without "+x" permission.
In order to make Pixel Logger can write config files in this folder.
This change will make sure "/data/vendor/wifi" have +x permission
Bug: 159650456
Test: wifi is workable
data/vendor/wifi with 771 permission
Change-Id: I5b396fc41a4eddefc04d43f8e3d276787d722726