ARM: dts: r8a7792: add QSPI clock

Describe the QSPI clock in the R8A7792 device tree.

Based  on the original (and large) patch by Vladimir Barinov
<vladimir.barinov@cogentembedded.com>.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7792.dtsi

@@ -860,6 +860,7 @@ mstp9_clks: mstp9_clks@e6150994 {
 			clocks = <&cp_clk>, <&cp_clk>, <&cp_clk>, <&cp_clk>,
 				 <&cp_clk>, <&cp_clk>, <&cp_clk>, <&cp_clk>,
 				 <&cp_clk>, <&cp_clk>, <&p_clk>, <&p_clk>,
+				 <&cpg_clocks R8A7792_CLK_QSPI>,
 				 <&cp_clk>, <&cp_clk>, <&hp_clk>, <&hp_clk>,
 				 <&hp_clk>, <&hp_clk>, <&hp_clk>, <&hp_clk>;
 			#clock-cells = <1>;
@@ -870,6 +871,7 @@ R8A7792_CLK_GPIO3 R8A7792_CLK_GPIO2
 				R8A7792_CLK_GPIO1 R8A7792_CLK_GPIO0
 				R8A7792_CLK_GPIO11 R8A7792_CLK_GPIO10
 				R8A7792_CLK_CAN1 R8A7792_CLK_CAN0
+				R8A7792_CLK_QSPI_MOD
 				R8A7792_CLK_GPIO9 R8A7792_CLK_GPIO8
 				R8A7792_CLK_I2C5 R8A7792_CLK_I2C4
 				R8A7792_CLK_I2C3 R8A7792_CLK_I2C2
@@ -879,8 +881,9 @@ R8A7792_CLK_I2C1 R8A7792_CLK_I2C0
 				"gpio7", "gpio6", "gpio5", "gpio4",
 				"gpio3", "gpio2", "gpio1", "gpio0",
 				"gpio11", "gpio10", "can1", "can0",
-				"gpio9", "gpio8", "i2c5", "i2c4",
-				"i2c3",	"i2c2", "i2c1", "i2c0";
+				"qspi_mod", "gpio9", "gpio8",
+				"i2c5", "i2c4", "i2c3", "i2c2",
+				"i2c1", "i2c0";
 		};
 	};