tpm: fix some doc warnings in tpm1-cmd.c

Fix the following make W=1 warnings:

  drivers/char/tpm/tpm1-cmd.c:325: warning: expecting prototype for tpm_startup(). Prototype was for tpm1_startup() instead
  drivers/char/tpm/tpm1-cmd.c:621: warning: expecting prototype for tpm_continue_selftest(). Prototype was for tpm1_continue_selftest() instead

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>