tpm: Call cmd_ready/go_idle for each command transmission

Some TPM implementations, particularly fTPM using the CRB interface,
require the TPM to transition through idle and ready states for each
command rather than once per session.

The current implementation calls cmd_ready once during tpm_chip_start()
and go_idle once during tpm_chip_stop(). For fTPM, when multiple commands
are sent without per-command idle transitions, subsequent commands timeout
as the TPM is waiting for the transition.

Fix this by calling cmd_ready before each command and go_idle on all exit
paths in tpm_try_transmit(). For TPM implementations that don't require
per-command transitions, the callbacks return immediately based on the
start method.

Remove the now-redundant per-session calls from tpm_chip_start() and
tpm_chip_stop() along with their helpers.

This resolves timeout errors during TPM initialization on systems where
BIOS has already performed TPM startup.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20260901213723.3017371-1-mario.limonciello@amd.com
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

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