nicky: fingerprint: use getService instead of tryGetService

* tryGetService is deprecated as https://cs.android.com/android/platform/superproject/+/master:prebuilts/vndk/v30/arm/include/generated-headers/hardware/interfaces/biometrics/fingerprint/2.2/android.hardware.biometrics.fingerprint@2.2_genc++_headers/gen/android/hardware/biometrics/fingerprint/2.2/IBiometricsFingerprint.h
thanks @dev-harsh1998 for pointing me this