dmaengine: sh: Remove unused shdma-arm.h

shdma-arm.h was introduced with commit 1e69653d ("DMA: shdma: add
r8a73a4 DMAC data to the device ID table"), and its sole user was
removed with commit a1978861 ("dmaengine: sh: Remove R-Mobile APE6
support"). The latter mentions r8a73a4.dtsi but shdma support was
removed from that with commit cfda8203 ("ARM: dts: r8a73a4: Remove
non-functional DMA support"), so it seems this is safe to remove.
Signed-off-by: Stephen Kitt <steve@sk2.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20221028115336.1052782-1-steve@sk2.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/sh/shdma-arm.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Renesas SuperH DMA Engine support
- *
- * Copyright (C) 2013 Renesas Electronics, Inc.
- */
-
-#ifndef SHDMA_ARM_H
-#define SHDMA_ARM_H
-
-#include "shdma.h"
-
-/* Transmit sizes and respective CHCR register values */
-enum {
-	XMIT_SZ_8BIT		= 0,
-	XMIT_SZ_16BIT		= 1,
-	XMIT_SZ_32BIT		= 2,
-	XMIT_SZ_64BIT		= 7,
-	XMIT_SZ_128BIT		= 3,
-	XMIT_SZ_256BIT		= 4,
-	XMIT_SZ_512BIT		= 5,
-};
-
-/* log2(size / 8) - used to calculate number of transfers */
-#define SH_DMAE_TS_SHIFT {		\
-	[XMIT_SZ_8BIT]		= 0,	\
-	[XMIT_SZ_16BIT]		= 1,	\
-	[XMIT_SZ_32BIT]		= 2,	\
-	[XMIT_SZ_64BIT]		= 3,	\
-	[XMIT_SZ_128BIT]	= 4,	\
-	[XMIT_SZ_256BIT]	= 5,	\
-	[XMIT_SZ_512BIT]	= 6,	\
-}
-
-#define TS_LOW_BIT	0x3 /* --xx */
-#define TS_HI_BIT	0xc /* xx-- */
-
-#define TS_LOW_SHIFT	(3)
-#define TS_HI_SHIFT	(20 - 2)	/* 2 bits for shifted low TS */
-
-#define TS_INDEX2VAL(i) \
-	((((i) & TS_LOW_BIT) << TS_LOW_SHIFT) |\
-	 (((i) & TS_HI_BIT)  << TS_HI_SHIFT))
-
-#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL((xmit_sz)))
-#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL((xmit_sz)))
-
-#endif