Revert "Prevent load_acquire redefinition in ordered_loads_only.h"
(That change is not needed because the file defines really only
load_acquire, and load_read is the same as in generalize-small.h)

This reverts commit ad464bf64a139cefa8b6f6e77b5f1f5ea1c51519.
Remove load_read, store_write redundant definition from ordered_X.h
(code refactoring)

* src/atomic_ops/sysdeps/loadstore/ordered_loads_only.template
(AO_XSIZE_load_read): Remove prototype (since defined by
generalize-small.template in the same way).
* src/atomic_ops/sysdeps/loadstore/ordered_stores_only.template
(AO_XSIZE_store_write): Likewise.
* src/atomic_ops/sysdeps/loadstore/ordered_stores_only.template
(AO_XSIZE_store_release): Define using AO_nop_write and AO_XSIZE_store
directly.
* src/atomic_ops/sysdeps/ordered_except_wr.h: Move include of
ordered_stores_only.h down to be after AO_nop_write definition.
* src/atomic_ops/sysdeps/read_ordered.h: Move include of
ordered_loads_only.h down to be after AO_nop_read definition.
* src/atomic_ops/sysdeps/loadstore/ordered_loads_only.h: Regenerate.
* src/atomic_ops/sysdeps/loadstore/ordered_stores_only.h: Likewise.