[TargetParser] Remove unused includes (NFC) (#116929)

Identified with misc-include-cleaner.

Author: kazutakahirata

llvm/lib/TargetParser/RISCVTargetParser.cpp

@@ -15,7 +15,6 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/TargetParser/RISCVISAInfo.h"
-#include "llvm/TargetParser/Triple.h"
 
 namespace llvm {
 namespace RISCV {

llvm/lib/TargetParser/SubtargetFeature.cpp

@@ -19,7 +19,6 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/TargetParser/Triple.h"
-#include <algorithm>
 #include <string>
 #include <vector>