UefiCpuPkg: Check SMM Delayed/Blocked AP Count

UefiCpuPkg: Check SMM Delayed/Blocked AP Count

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4173

Due to more core count increasement, it's hard to reflect all APs
state via AP bitvector support in the register. Actually, SMM CPU
driver doesn't need to check each AP state to know all CPUs in SMI
or not, one alternative method is to check the SMM Delayed & Blocked
AP Count number:

APs in SMI + Blocked Count + Disabled Count >= All supported Aps
(code comments explained why can be > All supported Aps)

With above change, the returned value of "SmmRegSmmEnable" &
"SmmRegSmmDelayed" & "SmmRegSmmBlocked" from SmmCpuFeaturesLib
should be the AP count number within the existing CPU package.

For register that return the bitvector state, require
SmmCpuFeaturesGetSmmRegister() returns count number of all bit per
logical processor within the same package.

For register that return the AP count, require
SmmCpuFeaturesGetSmmRegister() returns the register value directly.

v3:
- Refine the coding style

v2:
- Rename "mPackageBspInfo" to "mPackageFirstThreadIndex"
- Clarify the expected value of "SmmRegSmmEnable" & "SmmRegSmmDelayed" &
  "SmmRegSmmBlocked" returned from SmmCpuFeaturesLib.
- Thread: https://edk2.groups.io/g/devel/message/96722

v1:
- Thread: https://edk2.groups.io/g/devel/message/96671

Cc: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Zeng Star <star.zeng@intel.com>
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>