tpm: rename vendor data to priv and provide an accessor

  "data" was too generic a name for what's being used as a generic
private pointer by vendor-specific code. Rename it to "priv" and provide
a #define for users.

Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>

diff --cc drivers/char/tpm/tpm.h
Simple merge

diff --cc drivers/char/tpm/tpm_ibmvtpm.c
Simple merge