tpm: fix the type of owned field in cap_t

In cap_t the size of the type bool is assumed to be one byte. This
commit sorts out the issue by changing the type to u8.

Fixes: c659af78

 ("tpm: Check size of response before accessing data")
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>