I think this should be split into two patches and go first in the
series:

 1) remove all instances but shmem and generic_file_vm_ops given that
    remap_file_pages already doesn't work on anything that has a backing
    store and all these are dead
 2) kill the method and make the syscall call generic_file_remap_pages
    directly as this is a core VM feature.

These two should go first because they make sense even if we can't
actually go with the emulation yet.

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