iio: magnetometer: mmc35240: i2c device name should be lower case

This is the standard convention for i2c device name and
also this is the name used in some Intel platforms DT
files.

Fixes: abeb6b1e7b ("iio: magnetometer: Add support for MEMSIC MMC35240")
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c
index c71392c..d8cf5a6 100644
--- a/drivers/iio/magnetometer/mmc35240.c
+++ b/drivers/iio/magnetometer/mmc35240.c
@@ -490,7 +490,7 @@
 MODULE_DEVICE_TABLE(acpi, mmc35240_acpi_match);
 
 static const struct i2c_device_id mmc35240_id[] = {
-	{"MMC35240", 0},
+	{"mmc35240", 0},
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, mmc35240_id);