x86: cpu: microcode: Re-evaluate bugs in a CPU after microcode loading

x86: cpu: microcode: Re-evaluate bugs in a CPU after microcode loading

After doing a new microcode load, we have to re-evaluate bugs in the CPU in
order to see if the microcode brought changes. We clear caps for
X86_BUG_SPEC_STORE_BYPASS, X86_BUG_CPU_MELTDOWN and X86_BUG_L1TF as these can
be modified by new microcode loading.

Orabug: 29336760

Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>