tools/libxc: Drop config_transformed parameter from xc_cpuid_set()

tools/libxc: Drop config_transformed parameter from xc_cpuid_set()

libxl is now the sole caller of xc_cpuid_set().  The config_transformed output
is ignored, and this patch trivially highlights the resulting memory leak.

"transformed" config is now properly forwarded on migrate as part of the
general VM state, so delete the transformation logic completely, rather than
trying to adjust just libxl to avoid leaking memory.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Release-acked-by: Paul Durrant <paul@xen.org>
Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>