TPM trusted key RNG source change

[mimizohar]

The default TPM trusted key RNG source from the beginning was the TPM. Jarkko has attempted to change this to the kernel RNG numerous times. Here's latest version of changing the TPM trusted keys RNG source: https://lore.kernel.org/linux-integrity/20260125192526.782202-2-jarkko@kernel.org/

[robertosassu]

It still feels reasonable to keep the original code. If we don't reach an agreement we can consider to NAck the patch.

[robertosassu]

Jarkko hasn't responded yet to Mimi's email:

https://lore.kernel.org/linux-integrity/06a08cbbe47111a1795e5dcd42fb8cc4be643a72.camel@linux.ibm.com/

Waiting one more week.

[mimizohar]

Track to make sure it isn't removed:
As of now during the Linux v7.2 open window, .get_random was not removed from trusted_key_tpm_ops.

struct trusted_key_ops trusted_key_tpm_ops = {
.migratable = 1, /* migratable by default */
.init = trusted_tpm_init,
.seal = trusted_tpm_seal,
.unseal = trusted_tpm_unseal,
.get_random = trusted_tpm_get_random,
.exit = trusted_tpm_exit,
};