IntelSiliconPkg/MicrocodeUpdateDxe: Error message enhancement

IntelSiliconPkg/MicrocodeUpdateDxe: Error message enhancement

The error message of ExtendedTableCount is not clear. Add the count
number into the debug message.
https://bugzilla.tianocore.org/show_bug.cgi?id=1500

Cc: Ray Ni <ray.ni@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>