Add StringStrip op to Flex delegate

PiperOrigin-RevId: 334563150
Change-Id: I350ac50cc7e361705c3ed18fdd584ec1b117e24e
diff --git a/tensorflow/core/kernels/BUILD b/tensorflow/core/kernels/BUILD
index d623e51..8851531 100644
--- a/tensorflow/core/kernels/BUILD
+++ b/tensorflow/core/kernels/BUILD
@@ -6249,6 +6249,7 @@
         "string_lower_op.cc",
         "string_util.cc",
         "string_split_op.cc",
+        "string_strip_op.cc",
         "string_to_hash_bucket_op.cc",
         "substr_op.cc",
         "tensor_array.cc",
diff --git a/tensorflow/lite/delegates/flex/allowlisted_flex_ops.cc b/tensorflow/lite/delegates/flex/allowlisted_flex_ops.cc
index ccd22dac..8f4695d 100644
--- a/tensorflow/lite/delegates/flex/allowlisted_flex_ops.cc
+++ b/tensorflow/lite/delegates/flex/allowlisted_flex_ops.cc
@@ -540,6 +540,7 @@
           "StringLower",
           "StringSplit",
           "StringSplitV2",
+          "StringStrip",
           "StringToHashBucket",
           "StringToHashBucketFast",
           "StringToHashBucketStrong",