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/BaseCryptLibNull/BaseCryptLibNull.inf

@@ -50,6 +50,7 @@
   Pk/CryptX509Null.c
   Pk/CryptAuthenticodeNull.c
   Pk/CryptTsNull.c
+  Pk/CryptEcNull.c
   Pem/CryptPemNull.c
   Rand/CryptRandNull.c
   Pk/CryptRsaPssNull.c