i3c: Fix the verification of random PID

The validation of random PID should be done by checking the
boardinfo->pid instead of info.pid which is empty.

Doing the change the info struture declaration is no longer necessary.

Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: <stable@vger.kernel.org>
Fixes: 3a379bbc ("i3c: Add core I3C infrastructure")
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>