ALSA: hda: Remove unused snd_hdac_stream_get_spbmaxfifo

snd_hdac_stream_get_spbmaxfifo() was originally added in 2015
in commit ee8bc4d ("ALSA: hdac: Add support to enable SPIB for hdac
ext stream")

when it was originally called snd_hdac_ext_stream_set_spbmaxfifo,
it was renamed snd_hdac_ext_stream_get_spbmaxfifo shortly after
and was finally renamed to snd_hdac_stream_get_spbmaxfifo in 2022.
But it was never used.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250505011037.340592-1-linux@treblig.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Dr. David Alan Gilbert

include/sound/hdaudio.h

@@ -598,8 +598,6 @@ void snd_hdac_stream_spbcap_enable(struct hdac_bus *chip,
 				   bool enable, int index);
 int snd_hdac_stream_set_spib(struct hdac_bus *bus,
 			     struct hdac_stream *azx_dev, u32 value);
-int snd_hdac_stream_get_spbmaxfifo(struct hdac_bus *bus,
-				   struct hdac_stream *azx_dev);
 void snd_hdac_stream_drsm_enable(struct hdac_bus *bus,
 				 bool enable, int index);
 int snd_hdac_stream_wait_drsm(struct hdac_stream *azx_dev);

sound/hda/hdac_stream.c

@@ -825,25 +825,6 @@ int snd_hdac_stream_set_spib(struct hdac_bus *bus,
 }
 EXPORT_SYMBOL_GPL(snd_hdac_stream_set_spib);
 
-/**
- * snd_hdac_stream_get_spbmaxfifo - gets the spib value of a stream
- * @bus: HD-audio core bus
- * @azx_dev: hdac_stream
- *
- * Return maxfifo for the stream
- */
-int snd_hdac_stream_get_spbmaxfifo(struct hdac_bus *bus,
-				   struct hdac_stream *azx_dev)
-{
-	if (!bus->spbcap) {
-		dev_err(bus->dev, "Address of SPB capability is NULL\n");
-		return -EINVAL;
-	}
-
-	return readl(azx_dev->fifo_addr);
-}
-EXPORT_SYMBOL_GPL(snd_hdac_stream_get_spbmaxfifo);
-
 /**
  * snd_hdac_stream_drsm_enable - enable DMA resume for a stream
  * @bus: HD-audio core bus