tpm: reject duplicate PCR banks in tpm2_get_pcr_allocation

The TPM2_CAP_PCRS response is external input. tpm2_get_pcr_allocation()
adds every active selection to allocated_banks, while
tpm_sysfs_add_device() has one group slot per distinct hash algorithm.
Eight duplicate selections can therefore write past chip->groups[].

The TPM protocol does not allow a hash algorithm to appear twice in
this capability response. Treat a duplicate as a broken TPM and return
-EIO so the chip is not enabled, instead of silently dropping the
extra selection.

Assisted-by: LLM
Signed-off-by: Yuqi Xu <xuyuqiabc@gmail.com>
Reviewed-by: Ren Wei <weir@nebusec.ai>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/9d27c4513a3c6fc32f9574ba192cd3bfcb2bac98.1790568982.git.xuyuqiabc@gmail.com
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>