AMD fTPM patches for stable

["Jason A. Donenfeld" <Jason@zx2c4.com>]

Hey Greg,

There was recently a bit of a snafoo with a maintainer taking the wrong
version of a patch and sending that up to Linus. That patch had
incorrect stable@ annotations and had a bug in it. That bug was fixed
with a follow up patch. But of course the metadata couldn't be changed
easily retroactively.

So I'm emailing to ask you to backport these two patches back to 5.5:

- 554b841d4703 ("tpm: Disable RNG for all AMD fTPMs")
- cacc6e22932f ("tpm: Add a helper for checking hwrng enabled")

I know the stable@ tag says 6.1+, but the actual right tags from the
newer versioned patch that didn't get picked are:

Cc: stable@vger.kernel.org # 5.5+
Fixes: b006c439d58d ("hwrng: core - start hwrng kthread also for untrusted sources")
Fixes: f1324bbc4011 ("tpm: disable hwrng for fTPM on some AMD designs")
Fixes: 3ef193822b25 ("tpm_crb: fix fTPM on AMD Zen+ CPUs")
Reported-by: daniil.stas@posteo.net
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217719
Reported-by: bitlord0xff@gmail.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217212
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

Let me know if you need any more info.

Thanks,
Jason