ASoC: rt5514: Add the sanity check for the driver_data in the resume function

If the rt5514 spi driver is loaded, but the snd_soc_platform_driver is not
loaded by the correct DAI settings, the NULL pointer will be gotten by
snd_soc_platform_get_drvdata in the resume function.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>