Fix DefaultRegionProviderChainNative.kt

Author: lauzadis

aws-runtime/aws-config/native/src/aws/sdk/kotlin/runtime/region/DefaultRegionProviderChainNative.kt

@@ -8,6 +8,7 @@ package aws.sdk.kotlin.runtime.region
 import aws.sdk.kotlin.runtime.config.imds.InstanceMetadataProvider
 import aws.sdk.kotlin.runtime.config.profile.AwsProfile
 import aws.smithy.kotlin.runtime.client.region.RegionProvider
+import aws.smithy.kotlin.runtime.client.region.RegionProviderChain
 import aws.smithy.kotlin.runtime.io.Closeable
 import aws.smithy.kotlin.runtime.util.LazyAsyncValue
 import aws.smithy.kotlin.runtime.util.PlatformProvider