arm64: dts: rockchip: assign rate to clk_rtc_32k on rk356x

clk_rtc_32k and its child clock clk_hdmi_cec detauls to a rate of 24 MHz
and not to 32 kHz on RK356x.

Fix this by assigning clk_rtc_32k a rate of 32768, also assign the parent
to clk_rtc32k_frac.
Signed-off-by: NJonas Karlman <jonas@kwiboo.se>
Link: https://lore.kernel.org/r/20230110225547.1563119-2-jonas@kwiboo.seSigned-off-by: NHeiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk356x.dtsi

@@ -422,8 +422,9 @@
 		clock-names = "xin24m";
 		#clock-cells = <1>;
 		#reset-cells = <1>;
-		assigned-clocks = <&cru PLL_GPLL>, <&pmucru PLL_PPLL>;
-		assigned-clock-rates = <1200000000>, <200000000>;
+		assigned-clocks = <&pmucru CLK_RTC_32K>, <&cru PLL_GPLL>, <&pmucru PLL_PPLL>;
+		assigned-clock-rates = <32768>, <1200000000>, <200000000>;
+		assigned-clock-parents = <&pmucru CLK_RTC32K_FRAC>;
 		rockchip,grf = <&grf>;
 	};