message: Fix mlir-hlo CMakefiles after internal change
diff: #
  set(LLVM_TARGET_DEFINITIONS mhlo_passes.td)
  -mlir_tablegen(mhlo_passes.h.inc -gen-pass-decls)
  +mlir_tablegen(mhlo_passes.h.inc -gen-pass-decls -name MHLO)
  add_public_tablegen_target(MLIRMhloPassIncGen)
  set(LLVM_TARGET_DEFINITIONS lmhlo_passes.td)
  -mlir_tablegen(lmhlo_passes.h.inc -gen-pass-decls)
  +mlir_tablegen(lmhlo_passes.h.inc -gen-pass-decls -name LMHLO)
  add_public_tablegen_target(MLIRLmhloPassIncGen)
  