ARM: dts: r8a7793: enable Audio DMAC peri peri via sound driver

Audio DMAC peri peri is no longer DMAEngine. it is supported by
sound driver. this patch enable it.

Base on work for the r8a7791 by Kuninori Morimoto.

Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7793.dtsi

@@ -1172,8 +1172,9 @@
 		reg =	<0 0xec500000 0 0x1000>, /* SCU */
 			<0 0xec5a0000 0 0x100>,  /* ADG */
 			<0 0xec540000 0 0x1000>, /* SSIU */
-			<0 0xec541000 0 0x280>;  /* SSI */
-		reg-names = "scu", "adg", "ssiu", "ssi";
+			<0 0xec541000 0 0x280>,  /* SSI */
+			<0 0xec740000 0 0x200>;  /* Audio DMAC peri peri*/
+		reg-names = "scu", "adg", "ssiu", "ssi", "audmapp";
 
 		clocks = <&mstp10_clks R8A7793_CLK_SSI_ALL>,
 			<&mstp10_clks R8A7793_CLK_SSI9>, <&mstp10_clks R8A7793_CLK_SSI8>,