arm64: dts: rockchip: assign clock rate for ACLK_VIO on rk3399

The ACLK_VIO is a parent clock used by a several children,
its suggested clock rate is 400MHz. Right now it gets 400MHz
because it sources from CPLL(800M) and divides by 2 after reset.
It's good not to rely on default values like this, so let's
explicitly set it.
NOTE: it's expected that at least one board may override cru node and
set the CPLL to 1.6 GHz. On that board it will be very important to be
explicit about aclk-vio being 400 MHz.
Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi

@@ -586,7 +586,8 @@ &cru {
 		<&cru PCLK_PERIHP>,
 		<&cru ACLK_PERILP0>, <&cru HCLK_PERILP0>,
 		<&cru PCLK_PERILP0>, <&cru ACLK_CCI>,
-		<&cru HCLK_PERILP1>, <&cru PCLK_PERILP1>;
+		<&cru HCLK_PERILP1>, <&cru PCLK_PERILP1>,
+		<&cru ACLK_VIO>;
 	assigned-clock-rates =
 		<600000000>, <800000000>,
 		<1000000000>,
@@ -594,7 +595,8 @@ &cru {
 		<37500000>,
 		<100000000>, <100000000>,
 		<50000000>, <800000000>,
-		<100000000>, <50000000>;
+		<100000000>, <50000000>,
+		<400000000>;
 };
 
 &emmc_phy {

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -1322,7 +1322,8 @@ cru: clock-controller@ff760000 {
 			<&cru PCLK_PERIHP>,
 			<&cru ACLK_PERILP0>, <&cru HCLK_PERILP0>,
 			<&cru PCLK_PERILP0>, <&cru ACLK_CCI>,
-			<&cru HCLK_PERILP1>, <&cru PCLK_PERILP1>;
+			<&cru HCLK_PERILP1>, <&cru PCLK_PERILP1>,
+			<&cru ACLK_VIO>;
 		assigned-clock-rates =
 			 <594000000>,  <800000000>,
 			<1000000000>,
@@ -1330,7 +1331,8 @@ cru: clock-controller@ff760000 {
 			  <37500000>,
 			 <100000000>,  <100000000>,
 			  <50000000>, <600000000>,
-			 <100000000>,   <50000000>;
+			 <100000000>,   <50000000>,
+			 <400000000>;
 	};
 
 	grf: syscon@ff770000 {