[MLIR][NFC] remove unnecessary includes form tablegen command

[xgupta]

Summary

With D77156 includes are not needed here.

[xgupta]

@ftynse please commit the revision, I don't have commit access.

[ftynse]

In D94216#2486231, @xgupta wrote:

@ftynse please commit the revision, I don't have commit access.

Could you please provide me with the identity (name and email address) to use the commit?

(Note that sending commits with arcanist preserves this information).

[xgupta]

Sure, Shivam Gupta & [e-mail]
Thank you.

mlir/cmake/modules/AddMLIR.cmake

function(add_mlir_interface interface)
   add_public_tablegen_target(MLIR${interface}IncGen)
   add_dependencies(mlir-generic-headers MLIR${interface}IncGen)
 endfunction()
 
 
 # Generate Documentation
 function(add_mlir_doc doc_filename command output_file output_directory)
   set(LLVM_TARGET_DEFINITIONS ${doc_filename}.td)
-  tablegen(MLIR ${output_file}.md ${command} "-I${MLIR_MAIN_INCLUDE_DIR}" "-I${MLIR_INCLUDE_DIR}")
+  tablegen(MLIR ${output_file}.md ${command})
   set(GEN_DOC_FILE ${MLIR_BINARY_DIR}/docs/${output_directory}${output_file}.md)
   add_custom_command(
           OUTPUT ${GEN_DOC_FILE}
           COMMAND ${CMAKE_COMMAND} -E copy
                   ${CMAKE_CURRENT_BINARY_DIR}/${output_file}.md
                   ${GEN_DOC_FILE}
           DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${output_file}.md)
   add_custom_target(${output_file}DocGen DEPENDS ${GEN_DOC_FILE})