iio: imu: inv_mpu6050: fix objects syntax in Makefile

#

obj-$(CONFIG_INV_MPU6050_IIO) += inv-mpu6050.o

inv-mpu6050-objs := inv_mpu_core.o inv_mpu_ring.o inv_mpu_trigger.o

inv-mpu6050-y := inv_mpu_core.o inv_mpu_ring.o inv_mpu_trigger.o

obj-$(CONFIG_INV_MPU6050_I2C) += inv-mpu6050-i2c.o

inv-mpu6050-i2c-objs := inv_mpu_i2c.o inv_mpu_acpi.o

inv-mpu6050-i2c-y := inv_mpu_i2c.o inv_mpu_acpi.o

obj-$(CONFIG_INV_MPU6050_SPI) += inv-mpu6050-spi.o

inv-mpu6050-spi-objs := inv_mpu_spi.o

inv-mpu6050-spi-y := inv_mpu_spi.o