i3c: prefix hexadecimal entries in sysfs

Hexadecimal values in sysfs should be prefixed with '0x' like e.g. PCI
and SCSI already do it. Also ensure the two digit length since BCR and
DCR are a byte in size.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250707115409.73545-2-wsa+renesas@sang-engineering.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: Wolfram Sang

drivers/i3c/master.c

@@ -141,7 +141,7 @@ static ssize_t bcr_show(struct device *dev,
 
 	i3c_bus_normaluse_lock(bus);
 	desc = dev_to_i3cdesc(dev);
-	ret = sprintf(buf, "%x\n", desc->info.bcr);
+	ret = sprintf(buf, "0x%02x\n", desc->info.bcr);
 	i3c_bus_normaluse_unlock(bus);
 
 	return ret;
@@ -158,7 +158,7 @@ static ssize_t dcr_show(struct device *dev,
 
 	i3c_bus_normaluse_lock(bus);
 	desc = dev_to_i3cdesc(dev);
-	ret = sprintf(buf, "%x\n", desc->info.dcr);
+	ret = sprintf(buf, "0x%02x\n", desc->info.dcr);
 	i3c_bus_normaluse_unlock(bus);
 
 	return ret;