dmaengine: edma: make edma_filter_fn private

With the audio driver no longer referring to this function, it
can be made private to the dmaengine driver itself, and the
header file removed.
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20190722081705.2084961-2-arnd@arndb.deSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ti/edma.c

@@ -15,7 +15,6 @@
 
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
-#include <linux/edma.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -2185,6 +2184,8 @@ static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
 }
 #endif
 
+static bool edma_filter_fn(struct dma_chan *chan, void *param);
+
 static int edma_probe(struct platform_device *pdev)
 {
 	struct edma_soc_info	*info = pdev->dev.platform_data;
@@ -2524,7 +2525,7 @@ static struct platform_driver edma_tptc_driver = {
 	},
 };
 
-bool edma_filter_fn(struct dma_chan *chan, void *param)
+static bool edma_filter_fn(struct dma_chan *chan, void *param)
 {
 	bool match = false;
 

include/linux/edma.h

-/*
- * TI EDMA DMA engine driver
- *
- * Copyright 2012 Texas Instruments
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#ifndef __LINUX_EDMA_H
-#define __LINUX_EDMA_H
-
-struct dma_chan;
-
-#if defined(CONFIG_TI_EDMA) || defined(CONFIG_TI_EDMA_MODULE)
-bool edma_filter_fn(struct dma_chan *, void *);
-#else
-static inline bool edma_filter_fn(struct dma_chan *chan, void *param)
-{
-	return false;
-}
-#endif
-
-#endif