cmake: support PATH argument in build_info()

# Usage:

#   build_info(<tag>... VALUE <value>... )

#   build_info(<tag>... PATH  <path>... )

#

# This function populates updates the build_info.yml info file with exchangable build information

# related to the current build.

# <tag>...: One of the pre-defined valid CMake keys supported by build info or vendor-specific.

#           See 'scripts/schemas/build-schema.yml' CMake section for valid tags.

# VALUE <value>... : value(s) to place in the build_info.yml file.

# PATH  <path>... : path(s) to place in the build_info.yml file. All paths are converted to CMake

#                   style. If no conversion is required, for example when paths are already

#                   guaranteed to be CMake style, then VALUE can also be used.

function(build_info)

  set(convert_path FALSE)

  set(arg_list ${ARGV})

  list(FIND arg_list VALUE index)

  if(index EQUAL -1)

    message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}(...) missing a required argument: VALUE")

    list(FIND arg_list PATH index)

    set(convert_path TRUE)

  endif()

  if(index EQUAL -1)

    message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}(...) missing a required argument: VALUE or PATH")

  endif()

  yaml_context(EXISTS NAME build_info result)

  list(SUBLIST arg_list ${index} -1 values)

  list(POP_FRONT values)

  if(convert_path)

    set(converted_values)

    foreach(val ${values})

      cmake_path(SET cmake_path "${val}")

      list(APPEND converted_values "${cmake_path}")

    endforeach()

    set(values "${converted_values}")

  endif()

  if(ARGV0 STREQUAL "vendor-specific")

    set(type VALUE)

  else()