The actual uses of intrinsics are already guarded by feature-specific
ifdefs in nvme_pcie_copy_command(), but the header itself should also
only be included when it will actually be needed.
Change-Id: Ife65d6432b8dfd9d9db80fe4e385ab76491874c0
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>