iio: mlx90614: Drop unused register macros

To simplify addition of support for new parts, drop unused register macros.
No functional change.
Acked-by: Crt Mori <cmo@melexis.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20230510102251.10118-3-marex@denx.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/temperature/mlx90614.c

@@ -35,8 +35,6 @@
 #define MLX90614_OP_SLEEP	0xff
 
 /* RAM offsets with 16-bit data, MSB first */
-#define MLX90614_RAW1	(MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */
-#define MLX90614_RAW2	(MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */
 #define MLX90614_TA	(MLX90614_OP_RAM | 0x06) /* ambient temperature */
 #define MLX90614_TOBJ1	(MLX90614_OP_RAM | 0x07) /* object 1 temperature */
 #define MLX90614_TOBJ2	(MLX90614_OP_RAM | 0x08) /* object 2 temperature */
@@ -52,8 +50,6 @@
 #define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
 #define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
 #define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
-#define MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */
-#define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_SHIFT)
 
 /* Timings (in ms) */
 #define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */