tests/driver_mma8x5x: adapt README with type param removal

tests/driver_mma8x5x/Makefile

 include ../Makefile.tests_common
 
-USEMODULE += mma8x5x
+USEMODULE += mma8x5x  # will work with all variants
 USEMODULE += xtimer
 
 include $(RIOTBASE)/Makefile.include

tests/driver_mma8x5x/README.md

@@ -3,14 +3,13 @@ This is a manual test application for the MMA8x5x accelerometer driver.
 
 # Usage
 This test application will initialize the MMA8x5x sensor with the following parameters:
- - default device type: MMA8652
  - full scale parameter set to +/-2 g
  - 200 Hz output data-rate
 
 To change these parameters, you can override them by setting their corresponding
 defines in your build environment, e.g.
 ```bash
-CFLAGS=-DMMA8X5X_PARAM_TYPE=MMA8X5X_TYPE_MMA8451 make ...
+CFLAGS=-DMMA8X5X_PARAM_ADDR=0x1d make ...
 ```
 See RIOT/drivers/mma8x5x_params.h for the default configuration.