hostapd(hidl): Check for psk length only for psk network config

Bug: 72386820
Test: a) mmm -j128 hardware/interfaces/wifi/hostapd/1.0/vts/functional/
b) adb push
out/target/product/taimen/data/nativetest/VtsHalWifiHostapdV1_0TargetTest/
VtsHalWifiHostapdV1_0TargetTest /data/
c) adb shell /data/VtsHalWifiHostapdV1_0TargetTest

Change-Id: I71c83cc82da7a3cda66787cc15618b4b8d3ec172
1 file changed