Move wpa_supplicant.conf from /system to /vendor

In order to make generic system image, wpa_supplicant.conf is moved from
system to vendor partition. wpa_supplicant.conf is non-generic; it is
used by wpa_supplicant which is now part of wifi HAL.

Bug: 36015569
Test: confirm that wpa_supplicant.conf is under /vendor/etc/wifi and
wifi is working correctly.

Change-Id: I6dc62c650f7a012ea667d4323a6e0f5aee06ac12
1 file changed