sh: dma: Drop incorrect SH_DMAC_BASE1 definition for SH4

None of the supported SH4 family SoCs features a second DMAC module. As
this definition negatively impacts DMA channel calculation for the above
targets, remove it from the code.
Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/20230527164452.64797-3-contact@artur-rojek.euSigned-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>

arch/sh/include/cpu-sh4/cpu/dma.h

@@ -13,6 +13,5 @@
 #define DMAE0_IRQ	evt2irq(0x6c0)
 
 #define SH_DMAC_BASE0	0xffa00000
-#define SH_DMAC_BASE1	0xffa00070
 
 #endif /* __ASM_CPU_SH4_DMA_H */