tpm: Export the function to set up the TPM log

In some cases, we may wish to set up the TPM log under full control of
a driver in U-Boot. Export the required function to make this possible.

This avoids calling the weak function tcg2_platform_get_log() when the
caller already knows where the log is.

Series-to: u-boot
Signed-off-by: Simon Glass <sjg@chromium.org>

include/tpm_tcg2.h

@@ -345,4 +345,13 @@ void tcg2_platform_startup_error(struct udevice *dev, int rc);
  */
 u32 tcg2_algorithm_to_mask(enum tpm2_algorithms);
 
+/**
+ * tcg2_log_init() - Set up the elog
+ *
+ * @dev: TPM device, used to find the number of PCRs
+ * @elog	Platform event log
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog);
+
 #endif /* __TPM_TCG_V2_H */

lib/tpm_tcg2.c

@@ -220,7 +220,7 @@ static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index,
 	return 0;
 }
 
-static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
+int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
 {
 	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 	struct tcg_efi_spec_id_event *ev;