tpm: cr50: Rename driver to work with of-platdata

Update the driver name to match the compatible string, so it can work
with of-platdata.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/tpm/cr50_i2c.c b/drivers/tpm/cr50_i2c.c
index 8b79240..b103a6f 100644
--- a/drivers/tpm/cr50_i2c.c
+++ b/drivers/tpm/cr50_i2c.c
@@ -742,8 +742,8 @@
 	{ }
 };
 
-U_BOOT_DRIVER(cr50_i2c) = {
-	.name   = "cr50_i2c",
+U_BOOT_DRIVER(google_cr50) = {
+	.name   = "google_cr50",
 	.id     = UCLASS_TPM,
 	.of_match = cr50_i2c_ids,
 	.ops    = &cr50_i2c_ops,