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 <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: John Paul Adrian Glaubitz <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: John Paul Adrian Glaubitz <[e-mail]>

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

···
 #define DMAE0_IRQ	evt2irq(0x6c0)
 
 #define SH_DMAC_BASE0	0xffa00000
-#define SH_DMAC_BASE1	0xffa00070
 
 #endif /* __ASM_CPU_SH4_DMA_H */