SecurityPkg Tcg2: Remove use of module internal API InternalIsZeroBuffer()

SecurityPkg Tcg2: Remove use of module internal API InternalIsZeroBuffer()

This commit removes the internal implementation of the function
InternalIsZeroBuffer(). Instead, it will use the API IsZeroBuffer() from
BaseMemoryLib in MdePkg.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>