x86/include/asm/msr-index.h: Add IFS Array test bits

Define MSR bitfields for enumerating support for Array BIST test.

Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230322003359.213046-5-jithu.joseph@intel.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>