UPSTREAM: spi: rockchip: add compatible string for rv1108 spi

The spi on rv1108 is the same as other rockchip based
socs, add compatible string for it.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
(cherry picked from commit 6b860e69e873be247d19174ab6b24d0b5741bf8c)

Change-Id: Ia89f3d1392ae27ce36352d5601255a0aca9d1f8f

Author: Andy Yan

Documentation/devicetree/bindings/spi/spi-rockchip.txt

@@ -7,6 +7,7 @@ Required Properties:
 
 - compatible: should be one of the following.
     "rockchip,px30-spi"   for px30   SoCs.
+    "rockchip,rv1108-spi" for rv1108 SoCs.
     "rockchip,rk3036-spi" for rk3036 SoCs.
     "rockchip,rk3066-spi" for rk3066 SoCs.
     "rockchip,rk3188-spi" for rk3188 SoCs.

drivers/spi/spi-rockchip.c

@@ -918,6 +918,7 @@ static const struct dev_pm_ops rockchip_spi_pm = {
 
 static const struct of_device_id rockchip_spi_dt_match[] = {
 	{ .compatible = "rockchip,px30-spi",   },
+	{ .compatible = "rockchip,rv1108-spi", },
 	{ .compatible = "rockchip,rk3036-spi", },
 	{ .compatible = "rockchip,rk3066-spi", },
 	{ .compatible = "rockchip,rk3188-spi", },