UefiPayloadPkg: Fix incorrect code on Fit function.

1. Add firmware volume need to check firmware volume exist or not.
2. Remove clang version check dependency.

Cc: Guo Dong <guo.dong@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james.lu@intel.com>
Cc: Gua Guo <gua.guo@intel.com>

Signed-off-by: BruceX Wang <brucex.wang@intel.com>
Reviewed-by: Gua Guo <gua.guo@intel.com>

UefiPayloadPkg/UniversalPayloadBuild.py

@@ -146,16 +146,6 @@ def BuildUniversalPayload(Args):
     ModuleReportPath = os.path.join(BuildDir, "UefiUniversalPayloadEntry.txt")
     UpldInfoFile = os.path.join(BuildDir, "UniversalPayloadInfo.bin")
 
-    if "CLANG_BIN" in os.environ:
-        LlvmObjcopyPath = os.path.join(os.environ["CLANG_BIN"], "llvm-objcopy")
-    else:
-        LlvmObjcopyPath = "llvm-objcopy"
-    try:
-        RunCommand('"%s" --version'%LlvmObjcopyPath)
-    except:
-        print("- Failed - Please check if LLVM is installed or if CLANG_BIN is set correctly")
-        sys.exit(1)
-
     Pcds = ""
     if (Args.pcd != None):
         for PcdItem in Args.pcd: