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Uses the RDRAND instruction if available and install EfiRngProtocol. The protocol may be used by iPXE or the Linux kernel to gather entropy. Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Guo Dong <guo.dong@intel.com> Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Change-Id: I0f74b64c6a7e8fc6fdd8ea8f2a416d8b7c0334f4