i2c: Make of_device_id array const

Make of_device_id array const, because all OF functions
handle it as const.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c
index 8720161..95b94767 100644
--- a/drivers/i2c/busses/i2c-st.c
+++ b/drivers/i2c/busses/i2c-st.c
@@ -847,7 +847,7 @@
 	return 0;
 }
 
-static struct of_device_id st_i2c_match[] = {
+static const struct of_device_id st_i2c_match[] = {
 	{ .compatible = "st,comms-ssc-i2c", },
 	{ .compatible = "st,comms-ssc4-i2c", },
 	{},