Add support for Ampere AmpereOne processors

* Add initial support for Fujitsu A64FX as generic ARMV8

The implementation is a hybird of the ARMV8 one with some of the
improved TX2 rountines along with specifying -march=v8.2-a

There is currently no simple way to query cache sizes on ARMV8, so this takes the number of cores as a trivial indication if the target is a server-class device with a big cache, or just a single-board toy or smartphone.

* Falkor is an ARMv8.0 with ARMv8.1 features, and chosing armv8.1-a for
   march generates instructions it cannot cope with. Reverting it back
   to armv8-a.
 * ThunderX2's build was left with a #define VULCAN, which made it miss
   the right compiler flags in Makefile.arm64, although it did create
   the right library in the end.

ARMv8 builds were a bit mixed up, with ThunderX2 code in ARMv8 mode
(which is not right because TX2 is ARMv8.1) as well as requiring a few
redundancies in the defines, making it harder to maintain and understand
what core has what. A few other minor issues were also fixed.

Tests were made on the following cores: A53, A57, A72, Falkor, ThunderX,
ThunderX2, and XGene.

Tests were: OpenBLAS/test, OpenBLAS/benchmark, BLAS-Tester.

A summary:
 * Removed TX2 code from ARMv8 build, to make sure it is compatible with
   all ARMv8 cores, not just v8.1. Also, the TX2 code has actually
   harmed performance on big cores.
 * Commoned up ARMv8 architectures' defines in params.h, to make sure
   that all will benefit from ARMv8 settings, in addition to their own.
 * Adding a few more cores, using ARMv8's include strategy, to benefit
   from compiler optimisations using mtune. Also updated cache
   information from the manuals, making sure we set good conservative
   values by default. Removed Vulcan, as it's an alias to TX2.
 * Auto-detecting most of those cores, but also updating the forced
   compilation in getarch.c, to make sure the parameters are the same
   whether compiled natively or forced arch.

Benefits:
 * ARMv8 build is now guaranteed to work on all ARMv8 cores
 * Improved performance for ARMv8 builds on some cores (A72, Falkor,
   ThunderX1 and 2: up to 11%) over current develop
 * Improved performance for *all* cores comparing to develop branch
   before TX2's patch (9% ~ 36%)
 * ThunderX1 builds are 14% faster than ARMv8 on TX1, 9% faster than
   current develop's branch and 8% faster than deveop before tx2 patches

Issues:
 * Regression from current develop branch for A53 (-12%) and A57 (-3%)
   with ARMv8 builds, but still faster than before TX2's commit (+15%
   and +24% respectively). This can be improved with a simplification of
   TX2's code, to be done in future patches. At least the code is
   guaranteed to be ARMv8.0 now.

Comments:
 * CortexA57 builds are unchanged on A57 hardware from develop's branch,
   which makes sense, as it's untouched.
 * CortexA72 builds improve over A57 on A72 hardware, even if they're
   using the same includes due to new compiler tunning in the makefile.

This patch reverts the decision of treating A53 like A57, which was
based on an analysis done on server class hardware and is not
representative of all A53s out there.

Fixes #1855.