objtool: Split out arch-specific CFI definitions

Some CFI definitions used by generic objtool code have no reason to vary
from one architecture to another.  Keep those definitions in generic
code and move the arch-specific ones to a new arch-specific header.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>