i2c: constify platform_device_id

The platform_device_id is not modified by these drivers and core uses it
as const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 5a84bea..06f34d1 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -713,7 +713,7 @@
 	return 0;
 }
 
-static struct platform_device_id rcar_i2c_id_table[] = {
+static const struct platform_device_id rcar_i2c_id_table[] = {
 	{ "i2c-rcar",		I2C_RCAR_GEN1 },
 	{ "i2c-rcar_gen1",	I2C_RCAR_GEN1 },
 	{ "i2c-rcar_gen2",	I2C_RCAR_GEN2 },