Add EFIAPI in CatPrint library function. Every function which uses
variable list need explicit use EFIAPI to force use MS ABI. This change
is needed to pass CLANG38 build.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Steven Shi <steven.shi@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>