BidirectionalSequenceLSTM op: Adds layer norm support.

Also updates documentation for this op and UnidirectionalSequenceLSTM
op.

Bug: 123644584

Test: in ag/6758764

Change-Id: I72d029fef6d890eb1771c21814b028b09af280c7
diff --git a/current.txt b/current.txt
index 9baa8ed..f49727c 100644
--- a/current.txt
+++ b/current.txt
@@ -510,7 +510,7 @@
 92714960d1a53fc2ec557302b41c7cc93d2636d8364a44bd0f85be0c92927ff8 android.hardware.neuralnetworks@1.2::IExecutionCallback
 83885d366f22ada42c00d8854f0b7e7ba4cf73ddf80bb0d8e168ce132cec57ea android.hardware.neuralnetworks@1.2::IPreparedModel
 e1c734d1545e1a4ae749ff1dd9704a8e594c59aea7c8363159dc258e93e0df3b android.hardware.neuralnetworks@1.2::IPreparedModelCallback
-730c74ee5a3dd61a73f150cf07653e4b928e413b0f228eb004541bfcc22ed245 android.hardware.neuralnetworks@1.2::types
+2ef1bab554ea484523b396e48033117dbbefc2f90269f9e7e3eb5a58ba50bfb9 android.hardware.neuralnetworks@1.2::types
 cf7a4ba516a638f9b82a249c91fb603042c2d9ca43fd5aad9cf6c0401ed2a5d7 android.hardware.nfc@1.2::INfc
 abf98c2ae08bf765db54edc8068e36d52eb558cff6706b6fd7c18c65a1f3fc18 android.hardware.nfc@1.2::types
 4cb252dc6372a874aef666b92a6e9529915aa187521a700f0789065c3c702ead android.hardware.power.stats@1.0::IPowerStats