drivers/i2c: Constify struct device * param to i2c fill ssdt callback

This change makes the struct device * param to callback function
called by i2c_generic_fill_ssdt() as const. This is in preparation to
make struct device * param to fill_ssdt as const.

Change-Id: I7556b672a7b0172ded44747af394f5b32b6209aa
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40707
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/i2c/generic/chip.h

@@ -77,7 +77,7 @@ struct drivers_i2c_generic_config {
  * config: Pointer to drivers_i2c_generic_config structure
  */
 void i2c_generic_fill_ssdt(struct device *dev,
-			void (*callback)(struct device *dev),
+			void (*callback)(const struct device *dev),
 			struct drivers_i2c_generic_config *config);
 
 #endif /* __I2C_GENERIC_CHIP_H__ */