Fix Xtensa Bazel build (#173073)

Just adds some missing configs

Author: Ahajha

utils/bazel/configure.bzl

@@ -25,6 +25,7 @@ DEFAULT_TARGETS = [
     "WebAssembly",
     "X86",
     "XCore",
+    "Xtensa",
 ]
 
 MAX_TRAVERSAL_STEPS = 1000000  # "big number" upper bound on total visited dirs

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -3402,6 +3402,58 @@ llvm_target_lib_list = [lib for lib in [
             ),
         ],
     },
+    {
+        "name": "Xtensa",
+        "short_name": "Xtensa",
+        "tbl_outs": [
+            (
+                ["-gen-asm-writer"],
+                "lib/Target/Xtensa/XtensaGenAsmWriter.inc",
+            ),
+            (
+                ["-gen-asm-matcher"],
+                "lib/Target/Xtensa/XtensaGenAsmMatcher.inc",
+            ),
+            (
+                ["-gen-callingconv"],
+                "lib/Target/Xtensa/XtensaGenCallingConv.inc",
+            ),
+            (
+                ["-gen-dag-isel"],
+                "lib/Target/Xtensa/XtensaGenDAGISel.inc",
+            ),
+            (
+                ["-gen-disassembler"],
+                "lib/Target/Xtensa/XtensaGenDisassemblerTables.inc",
+            ),
+            (
+                ["-gen-instr-info"],
+                "lib/Target/Xtensa/XtensaGenInstrInfo.inc",
+            ),
+            (
+                ["-gen-emitter"],
+                "lib/Target/Xtensa/XtensaGenMCCodeEmitter.inc",
+            ),
+            (
+                ["-gen-register-info"],
+                [
+                    "lib/Target/Xtensa/XtensaGenRegisterInfo.inc",
+                    "lib/Target/Xtensa/XtensaGenRegisterInfoEnums.inc",
+                    "lib/Target/Xtensa/XtensaGenRegisterInfoMCDesc.inc",
+                    "lib/Target/Xtensa/XtensaGenRegisterInfoHeader.inc",
+                    "lib/Target/Xtensa/XtensaGenRegisterInfoTargetDesc.inc",
+                ],
+            ),
+            (
+                ["-gen-sd-node-info"],
+                "lib/Target/Xtensa/XtensaGenSDNodeInfo.inc",
+            ),
+            (
+                ["-gen-subtarget"],
+                "lib/Target/Xtensa/XtensaGenSubtargetInfo.inc",
+            ),
+        ],
+    },
 ] if lib["name"] in llvm_targets]
 
 cc_library(