tools/libx[cl]: Don't use HVM_PARAM_PAE_ENABLED as a function parameter

tools/libx[cl]: Don't use HVM_PARAM_PAE_ENABLED as a function parameter

HVM_PARAM_PAE_ENABLED is set and consumed by the toolstack only.  It is in
practice a complicated and non-standard way of passing a boolean parameter
into xc_cpuid_apply_policy().

This is silly.  Pass PAE as a regular parameter instead.

In libxl__cpuid_legacy(), leave a rather better explaination of why only HVM
guests have a choice in PAE setting.

No change in how a guest is constructed.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>