x86/IBRS/IBPB: Set sysctl_ibrs/ibpb_enabled properly

x86/IBRS/IBPB: Set sysctl_ibrs/ibpb_enabled properly

init_scattered_cpuid_features() is called twice, first time from
early_cpu_init(), before 'noibrs' or 'noibpb' option are parsed.
This results in setting of sysctl_* variables. When we call
init_scattered_cpuid_features() the second time, after the boot options
have been parsed, init_scattered_cpuid_features() will leave sysctl_*
parameters unchanged (i.e. already set).

To avoid this, always set those variables based on ibrs/pb_inuse.

Orabug: 27382723

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>