CryptoPkg/BaseCryptLib.h: Add new API VerifyEKUsInPkcs7Signature

CryptoPkg/BaseCryptLib.h: Add new API VerifyEKUsInPkcs7Signature

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1402

Add a prototype of new API VerifyEKUsInPkcs7Signature.

Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
Cc: Ting Ye <ting.ye@intel.com>
Cc: Gang Wei <gang.wei@intel.com>
Cc: Wang Jian J <jian.j.wang@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>