Revert "Update min_sdk_versions to match WifiTrackerLib"

Revert "Update GoogleWifiTrackerLib min_sdk_version to match Wif..."

Revert "[WifiTrackerLib] Put @hide methods in separate wrapper p..."

Revert "Update TwoPanelSettingsLib min_sdk_version to match Sett..."

Revert "Update BluetoothServices min_sdk_version to match Settin..."

Revert "Update DroidTwoPanelSettingsLib min_sdk_version to match..."

Revert submission 13842044-wifitrackerlib-hideapi

Reason for revert: build breakage
Reverted Changes:
I85b8ed34a:[WifiTrackerLib] Put @hide methods in separate wra...
I891f51aab:Update DroidTwoPanelSettingsLib min_sdk_version to...
If8e82e047:Update GoogleWifiTrackerLib min_sdk_version to mat...
I4529627fb:Update BluetoothServices min_sdk_version to match ...
I87b46a09b:Update TwoPanelSettingsLib min_sdk_version to matc...
I65a3246b4:Update min_sdk_versions to match WifiTrackerLib

Change-Id: I083b764b42e5cf5476b1ec9ed3a9b2d5ed12afc9