[MLIR] Apply clang-tidy fixes for misc-use-internal-linkage in TosaCanonicalizations.cpp (NFC)

mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp

diff --git a/mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp b/mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp
index a85ff10..293c6af 100644
--- a/mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp
+++ b/mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp
@@ -38,7 +38,7 @@
 //===----------------------------------------------------------------------===//
 
 // Check that the zero point of the tensor and padding operations are aligned.
-bool checkMatchingPadConstAndZp(Value padConst, Value zp) {
+static bool checkMatchingPadConstAndZp(Value padConst, Value zp) {
   // Check that padConst is a constant value and a scalar tensor
   DenseElementsAttr padConstAttr;
   if (!matchPattern(padConst, m_Constant(&padConstAttr)) ||
@@ -889,8 +889,9 @@
 //===----------------------------------------------------------------------===//
 
 template <typename IntFolder, typename FloatFolder>
-DenseElementsAttr binaryFolder(DenseElementsAttr lhs, DenseElementsAttr rhs,
-                               RankedTensorType returnTy) {
+static DenseElementsAttr binaryFolder(DenseElementsAttr lhs,
+                                      DenseElementsAttr rhs,
+                                      RankedTensorType returnTy) {
   if (rhs && lhs && rhs.isSplat() && lhs.isSplat()) {
     auto lETy = llvm::cast<ShapedType>(lhs.getType()).getElementType();
     auto rETy = llvm::cast<ShapedType>(rhs.getType()).getElementType();