cros_ec: Use a hyphen in the uclass name

Device-tree rules require that aliases use a hyphen rather than a
underscore. Update the uclass name to fit with this.

This allows device-tree aliases to be used to refer to cros-ec devices,
for example:

	aliases {
	    cros-ec0 = &ec;
	    cros-ec1 = &pd;
	};
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

drivers/misc/cros_ec.c

@@ -1482,7 +1482,7 @@ int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable)
 
 UCLASS_DRIVER(cros_ec) = {
 	.id		= UCLASS_CROS_EC,
-	.name		= "cros_ec",
+	.name		= "cros-ec",
 	.per_device_auto_alloc_size = sizeof(struct cros_ec_dev),
 	.post_bind	= dm_scan_fdt_dev,
 	.flags		= DM_UC_FLAG_ALLOC_PRIV_DMA,