tpm: Avoid error message when process gets signal while waiting and other upstream fixes

Bugzilla: http://bugzilla.redhat.com/1983089  
  
Upstream Status: merged into the linux.git  
  
When rngd is run as root then lots of these types of message will appear  
in the kernel log if the TPM has been configured to provide random bytes:  
  
[ 7406.275163] tpm tpm0: tpm_transmit: tpm_recv: error -4  
  
The issue is caused by the following call that is interrupted while  
waiting for the TPM's response.  
  
sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);  
  
Rather than waiting for the response in the low level driver, have it use  
the polling loop in tpm_try_transmit().  
  
Include also other fixes for TPM from upstream.  
All commits apply cleanly, no change from the upstream.  
  
Signed-off-by: Štěpán Horáček <shoracek@redhat.com>