platform/x86/intel/ifs: Store IFS generation number

[ Upstream commit 97a5e801 ]

IFS generation number is reported via MSR_INTEGRITY_CAPS.  As IFS
support gets added to newer CPUs, some differences are expected during
IFS image loading and test flows.

Define MSR bitmasks to extract and store the generation in driver data,
so that driver can modify its MSR interaction appropriately.

Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Link: https://lore.kernel.org/r/20231005195137.3117166-2-jithu.joseph@intel.com


Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Stable-dep-of: 3114f77e ("platform/x86/intel/ifs: Initialize union ifs_status to zero")
Signed-off-by: Sasha Levin <sashal@kernel.org>