[SPARK-19088][SQL] Fix 2.10 build.

## What changes were proposed in this pull request?

Commit 6c70a38c broke the build for scala 2.10. The commit uses some reflections which are not available in Scala 2.10. This PR fixes them.

## How was this patch tested?

Existing tests.

Author: Takuya UESHIN <ueshin@databricks.com>

Closes #17473 from ueshin/issues/SPARK-19088.

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala

@@ -307,7 +307,8 @@ object ScalaReflection extends ScalaReflection {
           }
         }
 
-        val cls = t.dealias.companion.decl(TermName("newBuilder")) match {
+        val companion = t.normalize.typeSymbol.companionSymbol.typeSignature
+        val cls = companion.declaration(newTermName("newBuilder")) match {
           case NoSymbol => classOf[Seq[_]]
           case _ => mirror.runtimeClass(t.typeSymbol.asClass)
         }