CryptoPkg/Private/Protocol/Crypto.h: Remove duplicate function type

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3287



Remove duplicate declaration of the function prototype
EDKII_CRYPTO_RSA_GET_PUBLIC_KEY_FROM_X509.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
Cc: Guomin Jiang <guomin.jiang@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>