sh: Add SH7724 support to NR_ONCHIP_DMA_CHANNELS

This patch also update help comment

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/drivers/dma/Kconfig

@@ -27,12 +27,12 @@ config NR_ONCHIP_DMA_CHANNELS
 	default "8" if CPU_SUBTYPE_SH7750R || CPU_SUBTYPE_SH7751R || \
 		       CPU_SUBTYPE_SH7760
 	default "12" if CPU_SUBTYPE_SH7723 || CPU_SUBTYPE_SH7780  || \
-			CPU_SUBTYPE_SH7785
+			CPU_SUBTYPE_SH7785 || CPU_SUBTYPE_SH7724
 	default "6"
 	help
 	  This allows you to specify the number of channels that the on-chip
-	  DMAC supports. This will be 4 for SH7091/SH7750/SH7751 and 8 for the
-	  SH7750R/SH7751R.
+	  DMAC supports. This will be 4 for SH7750/SH7751/Sh7750S/SH7091 and 8 for the
+	  SH7750R/SH7751R/SH7760, 12 for the SH7723/SH7780/SH7785/SH7724, default is 6.
 
 config NR_DMA_CHANNELS_BOOL
 	depends on SH_DMA