Move code in settingslib/devicestate into its own module

Code in SettingsProvider will need to use DeviceStateRotationLockSettingsManager,
but shouldn't have to pull in the entire SettingsLib just for one class.

Bug: 196933725
Test: atest DeviceStateRotationLockSettingsManagerTest
Test: build Android
Change-Id: I93679700c1638396c5930386c82fa23f1f3ad6a0
diff --git a/packages/SettingsLib/Android.bp b/packages/SettingsLib/Android.bp
index 9a80b02..87e61b5 100644
--- a/packages/SettingsLib/Android.bp
+++ b/packages/SettingsLib/Android.bp
@@ -50,6 +50,7 @@
         "SettingsLibTwoTargetPreference",
         "SettingsLibSettingsTransition",
         "SettingsLibButtonPreference",
+        "SettingsLibDeviceStateRotationLock",
         "setupdesign",
         "zxing-core-1.7",
     ],