Enable TOSA conversions in bazel build rules (#4023)

Follows #4021.

Also pushes a small pre-commit fix.

Bazel CI triggered here:
https://github.com/sjain-stanford/torch-mlir/actions/runs/13297425038/job/37132415527

Author: sjain-stanford

build_tools/autogen_ltc_backend.py

@@ -34,7 +34,8 @@
 try:
     from yaml import CSafeLoader as Loader
 except ImportError:
-    from yaml import SafeLoader as Loader #type:ignore[assignment, misc]
+    from yaml import SafeLoader as Loader  # type:ignore[assignment, misc]
+
 
 def reindent(text, prefix=""):
     return indent(dedent(text), prefix)

utils/bazel/torch-mlir-overlay/BUILD.bazel

@@ -278,6 +278,7 @@ gentbl_cc_library(
             [
                 "-gen-pass-decls",
                 "-DTORCH_MLIR_ENABLE_STABLEHLO",
+                "-DTORCH_MLIR_ENABLE_TOSA",
             ],
             "include/torch-mlir/Conversion/Passes.h.inc",
         ),
@@ -334,6 +335,7 @@ gentbl_cc_library(
             [
                 "-gen-pass-decls",
                 "-DTORCH_MLIR_ENABLE_STABLEHLO",
+                "-DTORCH_MLIR_ENABLE_TOSA",
             ],
             "include/torch-mlir/Dialect/TorchConversion/Transforms/Passes.h.inc",
         ),
@@ -542,6 +544,7 @@ cc_library(
     ],
     defines = [
         "TORCH_MLIR_ENABLE_STABLEHLO",
+        "TORCH_MLIR_ENABLE_TOSA",
     ],
     strip_include_prefix = "include",
     deps = [
@@ -566,6 +569,7 @@ cc_library(
     hdrs = glob(["include/torch-mlir/Dialect/TorchConversion/Transforms/*.h"]),
     defines = [
         "TORCH_MLIR_ENABLE_STABLEHLO",
+        "TORCH_MLIR_ENABLE_TOSA",
     ],
     strip_include_prefix = "include",
     deps = [
@@ -600,6 +604,9 @@ cc_library(
         "lib/Conversion/TorchToTosa/*.cpp",
     ]),
     hdrs = glob(["include/torch-mlir/Conversion/TorchToTosa/*.h"]),
+    defines = [
+        "TORCH_MLIR_ENABLE_TOSA",
+    ],
     strip_include_prefix = "include",
     deps = [
         ":TorchMLIRConversionPassesIncGen",
@@ -887,6 +894,7 @@ cc_library(
     copts = [
         "-DTORCH_MLIR_ENABLE_REFBACKEND",
         "-DTORCH_MLIR_ENABLE_STABLEHLO",
+        "-DTORCH_MLIR_ENABLE_TOSA",
     ],
     strip_include_prefix = "include",
     deps = [