x86/hypercall: Move the hypercall tables into C

x86/hypercall: Move the hypercall tables into C

Editing (and indeed, finding) the hypercall tables can be tricky, especially
towards the end where .rept's are used to maintain the correct layout.

Move this all into C, and let the compiler do the hard work.

To do this, xen/hypercall.h and asm-x86/hypercall.h need to contain prototypes
for all the hypercalls; some were previously missing.  This in turn requires
some shuffling of definitions and includes.

One difference is that NULL function pointers are used instead of
{,compat_}do_ni_hypercall(), which pv_hypercall() handles correctly.  All
ni_hypercall() infrastructure is therefore dropped.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>