sh: Fix up number of on-chip DMA channels on SH7091.

This accidentally regressed when the multi-IRQ changes went in,
switching SH7091 from 4 to 6 channels. Add SH7091 back in to the
4-channel dependency list.
Reported-by: NAdrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/drivers/dma/Kconfig

@@ -12,21 +12,25 @@ config SH_DMA
 config SH_DMA_IRQ_MULTI
 	bool
 	depends on SH_DMA
-	default y if CPU_SUBTYPE_SH7750 || CPU_SUBTYPE_SH7751 || \
-		CPU_SUBTYPE_SH7750S || CPU_SUBTYPE_SH7750R || CPU_SUBTYPE_SH7751R || \
-		CPU_SUBTYPE_SH7091 || CPU_SUBTYPE_SH7763 || CPU_SUBTYPE_SH7764 || \
-		CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785
+	default y if CPU_SUBTYPE_SH7750  || CPU_SUBTYPE_SH7751  || \
+		     CPU_SUBTYPE_SH7750S || CPU_SUBTYPE_SH7750R || \
+		     CPU_SUBTYPE_SH7751R || CPU_SUBTYPE_SH7091  || \
+		     CPU_SUBTYPE_SH7763  || CPU_SUBTYPE_SH7764  || \
+		     CPU_SUBTYPE_SH7780  || CPU_SUBTYPE_SH7785
 
 config NR_ONCHIP_DMA_CHANNELS
 	int
 	depends on SH_DMA
-	default "4" if CPU_SUBTYPE_SH7750 || CPU_SUBTYPE_SH7751 || CPU_SUBTYPE_SH7750S
-	default "8" if CPU_SUBTYPE_SH7750R || CPU_SUBTYPE_SH7751R || CPU_SUBTYPE_SH7760
-	default "12" if CPU_SUBTYPE_SH7723 || CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785
+	default "4" if CPU_SUBTYPE_SH7750  || CPU_SUBTYPE_SH7751  || \
+		       CPU_SUBTYPE_SH7750S || CPU_SUBTYPE_SH7091
+	default "8" if CPU_SUBTYPE_SH7750R || CPU_SUBTYPE_SH7751R || \
+		       CPU_SUBTYPE_SH7760
+	default "12" if CPU_SUBTYPE_SH7723 || CPU_SUBTYPE_SH7780  || \
+			CPU_SUBTYPE_SH7785
 	default "6"
 	help
 	  This allows you to specify the number of channels that the on-chip
-	  DMAC supports. This will be 4 for SH7750/SH7751 and 8 for the
+	  DMAC supports. This will be 4 for SH7091/SH7750/SH7751 and 8 for the
 	  SH7750R/SH7751R.
 
 config NR_DMA_CHANNELS_BOOL