x86: unify module_{32|64}.h

This adds one case to the MODULE_PROC_FAMILY block testing
for X86_64.  There are no new things defined on X86_64 than
there were before.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>