iio: chemical: bme680: indent #defines consistently

#define BME680_REG_GAS_MSB			0x2A

#define BME680_REG_GAS_R_LSB			0x2B

#define   BME680_GAS_STAB_BIT			BIT(4)

#define   BME680_GAS_RANGE_MASK			0x0F

#define BME680_REG_CTRL_HUMIDITY		0x72

#define   BME680_OSRS_HUMIDITY_MASK		GENMASK(2, 0)

#define   BME680_OSRS_TEMP_MASK			GENMASK(7, 5)

#define   BME680_OSRS_PRESS_MASK		GENMASK(4, 2)

#define   BME680_MODE_MASK			GENMASK(1, 0)

#define     BME680_MODE_FORCED			1

#define     BME680_MODE_SLEEP			0

#define   BME680_RSERROR_MSK			0xF0

#define BME680_REG_RES_HEAT_0			0x5A

#define BME680_REG_GAS_WAIT_0			0x64

#define BME680_GAS_RANGE_MASK			0x0F

#define BME680_ADC_GAS_RES_SHIFT		6

#define BME680_AMB_TEMP				25