Add shutdown call back to close existing session with fTPM TA
to support kexec scenario.

Add parentheses to function names in comments as specified in kdoc.
Signed-off-by: NThirupathaiah Annapureddy <thiruan@microsoft.com>
Signed-off-by: NPavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>