tpm: declare tpm2_get_pcr_allocation() as static

There's no need to export tpm2_get_pcr_alloation() because it is only
a helper function for tpm2_auto_startup(). For the same reason it does
not make much sense to maintain documentation for it.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

drivers/char/tpm/tpm.h

@@ -554,5 +554,4 @@ int tpm2_auto_startup(struct tpm_chip *chip);
 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 int tpm2_probe(struct tpm_chip *chip);
-ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
 #endif