Switch to utilize common heap based tpm_buf code for TPM based trusted
and asymmetric keys rather than using stack based tpm1_buf code. Also,
remove tpm1_buf code.
Suggested-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxx>
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