CryptoPkg: Add EC support

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3828

This patch is used to add CryptEc library, which is wrapped
over OpenSSL.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyu1.lu@intel.com>
Cc: Guomin Jiang <guomin.jiang@intel.com>

Signed-off-by: Yi Li <yi1.li@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf

@@ -53,6 +53,8 @@
   Pk/CryptTs.c
   Pk/CryptRsaPss.c
   Pk/CryptRsaPssSign.c
+  Pk/CryptEcNull.c    |*|*|*|!gEfiCryptoPkgTokenSpaceGuid.PcdOpensslEcEnabled
+  Pk/CryptEc.c    |*|*|*|gEfiCryptoPkgTokenSpaceGuid.PcdOpensslEcEnabled
   Pem/CryptPem.c
   Bn/CryptBn.c