tpm: Correct TI50_FIRMWARE_VERSION_NOT_SUPPORTED help text

Reading firmware_version register is supported on Ti50 version
0.22.4. Therefore correct the help text of the Kconfig option
TI50_FIRMWARE_VERSION_NOT_SUPPORTED.

Also change the message level to BIOS_WARNING.

BUG=b:234533588
TEST=emerge-corsola coreboot
BRANCH=none

Change-Id: I66a0ef896c9dc4cd0f586555a55dbcd1cfd863f9
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66906
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Andrey Pronin <apronin@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
diff --git a/src/drivers/tpm/cr50.c b/src/drivers/tpm/cr50.c
index 1724b8d..1fe6cf8 100644
--- a/src/drivers/tpm/cr50.c
+++ b/src/drivers/tpm/cr50.c
@@ -193,7 +193,7 @@
 		goto success;
 
 	if (CONFIG(TI50_FIRMWARE_VERSION_NOT_SUPPORTED)) {
-		printk(BIOS_ERR, "Reading Ti50 firmware version is not supported\n");
+		printk(BIOS_WARNING, "Reading Ti50 firmware version is not supported\n");
 		if (version)
 			*version = cr50_firmware_version;
 		return CB_ERR;
diff --git a/src/security/tpm/tss/vendor/cr50/Kconfig b/src/security/tpm/tss/vendor/cr50/Kconfig
index 547f0fd..a483e36 100644
--- a/src/security/tpm/tss/vendor/cr50/Kconfig
+++ b/src/security/tpm/tss/vendor/cr50/Kconfig
@@ -34,11 +34,11 @@
 	bool
 	default n
 	help
-	  Ti50 FW versions below 0.15 don't support the firmware_version register,
+	  Ti50 FW versions below 0.22.4 don't support the firmware_version register,
 	  and trying to access it causes I2C errors. This config will skip accesses
 	  to the register, and should be selected for boards using Ti50 chips with
-	  FW < 0.0.15. The config will be removed once all Ti50 stocks are updated to
-	  0.0.15 or higher.
+	  FW < 0.22.4. The config will be removed once all Ti50 stocks are updated to
+	  0.22.4 or higher.
 
 config GOOGLE_TPM_IRQ_TIMEOUT_MS
 	int