[Hexagon] Fix license headers in some .td files, NFC

llvm/lib/Target/Hexagon/HexagonIntrinsicsV60.td

@@ -1,4 +1,4 @@
-//=- HexagonIntrinsicsV60.td - Target Description for Hexagon -*- tablegen *-=//
+//===- HexagonIntrinsicsV60.td - V60 instruction intrinsics -*- tablegen *-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

llvm/lib/Target/Hexagon/HexagonPatterns.td

@@ -1,4 +1,4 @@
-//==- HexagonPatterns.td - Target Description for Hexagon -*- tablegen -*-===//
+//===- HexagonPatterns.td - Selection Patterns for Hexagon -*- tablegen -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

llvm/lib/Target/Hexagon/HexagonPatternsHVX.td

@@ -1,3 +1,12 @@
+//===- HexagonPatternsHVX.td - Selection Patterns for HVX --*- tablegen -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+
 def SDTVecUnaryOp:
   SDTypeProfile<1, 1, [SDTCisVec<0>, SDTCisVec<1>]>;