hash.h: remove unused define directive

Patch series "test_hash.c: refactor into KUnit", v3.

We refactored the lib/test_hash.c file into KUnit as part of the student
group LKCAMP [1] introductory hackathon for kernel development.

This test was pointed to our group by Daniel Latypov [2], so its full
conversion into a pure KUnit test was our goal in this patch series, but
we ran into many problems relating to it not being split as unit tests,
which complicated matters a bit, as the reasoning behind the original
tests is quite cryptic for those unfamiliar with hash implementations.

Some interesting developments we'd like to highlight are:

 - In patch 1/5 we noticed that there was an unused define directive
   that could be removed.

 - In patch 4/5 we noticed how stringhash and hash tests are all under
   the lib/test_hash.c file, which might cause some confusion, and we
   also broke those kernel config entries up.

Overall KUnit developments have been made in the other patches in this
series:

In patches 2/5, 3/5 and 5/5 we refactored the lib/test_hash.c file so as
to make it more compatible with the KUnit style, whilst preserving the
original idea of the maintainer who designed it (i.e.  George Spelvin),
which might be undesirable for unit tests, but we assume it is enough
for a first patch.

This patch (of 5):

Currently, there exist hash_32() and __hash_32() functions, which were
introduced in a patch [1] targeting architecture specific optimizations.
These functions can be overridden on a per-architecture basis to achieve
such optimizations.  They must set their corresponding define directive
(HAVE_ARCH_HASH_32 and HAVE_ARCH__HASH_32, respectively) so that header
files can deal with these overrides properly.

As the supported 32-bit architectures that have their own hash function
implementation (i.e.  m68k, Microblaze, H8/300, pa-risc) have only been
making use of the (more general) __hash_32() function (which only lacks
a right shift operation when compared to the hash_32() function), remove
the define directive corresponding to the arch-specific hash_32()
implementation.

[1] https://lore.kernel.org/lkml/[email protected]/

[[email protected]: hash_32_generic() becomes hash_32()]

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Reviewed-by: David Gow <[email protected]>
Tested-by: David Gow <[email protected]>
Co-developed-by: Augusto Durães Camargo <[email protected]>
Signed-off-by: Augusto Durães Camargo <[email protected]>
Co-developed-by: Enzo Ferreira <[email protected]>
Signed-off-by: Enzo Ferreira <[email protected]>
Signed-off-by: Isabella Basso <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Brendan Higgins <[email protected]>
Cc: Daniel Latypov <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Rodrigo Siqueira <[email protected]>
Cc: kernel test robot <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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