x86: don't call generic_identify() redundantly

x86: don't call generic_identify() redundantly

Right before calling struct cpu_dev's ->c_identify, if non-NULL,
identify_cpu() calls generic_identify(). Hence there's no point for
->c_identify to point to generic_identify, nor for the handler to call
that function. After removing all pointless uses, the function isn't
being used outside the file that's defininig it anymore, and hence can
become static.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>