tpm: cr50: i2c: use jiffies to wait for tpm ready irq

When waiting for a tpm ready completion, the cr50 i2c driver incorrectly
assumes that the value of timeout_a is represented in milliseconds
instead of jiffies.

Remove the msecs_to_jiffies conversion.

Signed-off-by: Mark Hasemeyer <markhas@chromium.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>