tpm2d: Use BYTE type to acces TPM2B object.

* tpm2d/tpm2.c (tpm2_SensitiveToDuplicate): Don't use the cast
of (TPM2B *).

While it works (since the actual access is done by the macros),
compiler may complain the alignment property of type BYTE * and TPM2B
object is different.

• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>