mraa: Temporarily turn off deprecated warnings
mraa: Temporarily turn off deprecated warnings

MRAA deprecated mraa_gpio_use_mmaped which gets flagged as a warning
in UPM and then fails since -Werror is set.

For now, don't flag deprecations as warnings.

Signed-off-by: Noel Eck <1e36ab6ededef40f3f16bdbc1b09eee72c5d08cf@intel.com>

Propanu/upm,pylbert/upm,intel-iot-devkit/upm,pylbert/upm,pylbert/upm,g-vidal/upm,stefan-andritoiu/upm,stefan-andritoiu/upm,g-vidal/upm,stefan-andritoiu/upm,intel-iot-devkit/upm,Propanu/upm,Propanu/upm,pylbert/upm,pylbert/upm,intel-iot-devkit/upm,stefan-andritoiu/upm,g-vidal/upm,pylbert/upm,g-vidal/upm,intel-iot-devkit/upm,Propanu/upm,intel-iot-devkit/upm,g-vidal/upm,Propanu/upm,g-vidal/upm,Propanu/upm,stefan-andritoiu/upm,intel-iot-devkit/upm,stefan-andritoiu/upm