ALSA: memalloc: Drop snd_dma_pci_data() macro

Now that all users have been converted, we can drop snd_dma_pci_data()
macro definition.

Link: https://lore.kernel.org/r/20191108164637.1110-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/memalloc.h

@@ -21,7 +21,6 @@ struct snd_dma_device {
 	struct device *dev;		/* generic device */
 };
 
-#define snd_dma_pci_data(pci)	(&(pci)->dev)
 #define snd_dma_continuous_data(x)	((struct device *)(__force unsigned long)(x))