spi: sh-msiof: Document r8a77470 bindings

Document SoC specific bindings for R-Car RZ/G1C(r8a77470) SoC.

Signed-off-by: Cao Van Dong <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

Author: Cao Van Dong

Documentation/devicetree/bindings/spi/sh-msiof.txt

@@ -4,6 +4,7 @@ Required properties:
 - compatible           : "renesas,msiof-r8a7743" (RZ/G1M)
 			 "renesas,msiof-r8a7744" (RZ/G1N)
 			 "renesas,msiof-r8a7745" (RZ/G1E)
+			 "renesas,msiof-r8a77470" (RZ/G1C)
 			 "renesas,msiof-r8a774a1" (RZ/G2M)
 			 "renesas,msiof-r8a774c0" (RZ/G2E)
 			 "renesas,msiof-r8a7790" (R-Car H2)