x86/hypercall: Move the hypercall arg tables into C

x86/hypercall: Move the hypercall arg tables into C

Editing (and indeed, finding) the hypercall args 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.  As 0 is the
default value, drop all explicit 0's.

No functional change.

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