mmap-gpio: remove deprecated mmapped gpio function calls

The memory mapped GPIO function calls have been deprecated and in turn removed from the UPM libraries. MRAA now provides the best/fastest GPIO access possible based on the selected platform/pin automatically.

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/speaker/speaker.c

@@ -100,11 +100,6 @@ speaker_context speaker_init(int pin)
         return NULL;
     }
 
-#if defined(UPM_PLATFORM_LINUX)
-    // Would prefer, but not fatal if not available
-    mraa_gpio_use_mmaped(dev->gpio, 1);
-#endif // UPM_PLATFORM_LINUX
-
     mraa_gpio_dir(dev->gpio, MRAA_GPIO_OUT);
 
     return dev;