VMX: drop bogus gpa parameter from __invept()

VMX: drop bogus gpa parameter from __invept()

Perhaps there once was a plan to have a flush type requiring this, but
the current SDM has no mention of such and all callers pass zero anyway.

Take the opportunity and also change involved types to uint64_t.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>