sandbox: i2c: Rename driver names to work with of-platdata

Some of these do not follow the rules. Make sure the driver name matches
the compatible string in all cases.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/i2c-emul-uclass.c b/drivers/i2c/i2c-emul-uclass.c
index 085b824..75d7988 100644
--- a/drivers/i2c/i2c-emul-uclass.c
+++ b/drivers/i2c/i2c-emul-uclass.c
@@ -85,8 +85,8 @@
 	{ }
 };
 
-U_BOOT_DRIVER(i2c_emul_parent_drv) = {
-	.name		= "i2c_emul_parent_drv",
+U_BOOT_DRIVER(sandbox_i2c_emul_parent) = {
+	.name		= "sandbox_i2c_emul_parent",
 	.id		= UCLASS_I2C_EMUL_PARENT,
 	.of_match	= i2c_emul_parent_ids,
 };