arch/x86: Generalize cache manipulation functions

We assume that all x86 CPUs do have clflush instructions.
And the cache line size is now provided through DTS.

So detecting clflush instruction as well as the cache line size is no
longer required at runtime and thus removed.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
10 files changed