tpm_crb: tpm2_shutdown() must be called before tpm_chip_unregister()

Wrong call order.

Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Fixes: 74d6b3ce
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
cc: stable@vger.kernel.org