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
