arm64: dts: rockchip: Drop assigned-clock* from cpu nodes on rk3588

The assigned-clocks and assigned-clock-rates properties were moved from
the scmi_clk node onto cpu nodes in commit
87810bd ("arm64: dts: rockchip: Fix SCMI assigned clocks on rk3588s")

During review of v1 of that patch set, the following comment was made:

  why aren't you using OPP tables to define CPU frequencies.
  Assigned-clocks looks like a temporary hack because you haven't
  done proper OPP tables.

Some time later, proper OPP tables for rk3588 were added in commit
276856d ("arm64: dts: rockchip: Add OPP data for CPU cores on RK3588")

So this 'temporary hack' is no longer needed.
Dropping it fixes the following dtb validation issues:

  cpu@0: Unevaluated properties are not allowed
    ('assigned-clock-rates', 'assigned-clocks' were unexpected)
  cpu@400: Unevaluated properties are not allowed
    ('assigned-clock-rates', 'assigned-clocks' were unexpected)
  cpu@600: Unevaluated properties are not allowed
    ('assigned-clock-rates', 'assigned-clocks' were unexpected)

Link: https://lore.kernel.org/linux-rockchip/CAL_JsqL_EogoKOQ1xwU75=rJSC4o7yV3Jej4vadtacX2Pt3-hw@mail.gmail.com/
Signed-off-by: Diederik de Haas <didi.debian@cknow.org>
Link: https://lore.kernel.org/r/20250519101909.62754-1-didi.debian@cknow.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: diederikdehaas

arch/arm64/boot/dts/rockchip/rk3588-base.dtsi

@@ -96,8 +96,6 @@
 			enable-method = "psci";
 			capacity-dmips-mhz = <530>;
 			clocks = <&scmi_clk SCMI_CLK_CPUL>;
-			assigned-clocks = <&scmi_clk SCMI_CLK_CPUL>;
-			assigned-clock-rates = <816000000>;
 			cpu-idle-states = <&CPU_SLEEP>;
 			i-cache-size = <32768>;
 			i-cache-line-size = <64>;
@@ -174,8 +172,6 @@
 			enable-method = "psci";
 			capacity-dmips-mhz = <1024>;
 			clocks = <&scmi_clk SCMI_CLK_CPUB01>;
-			assigned-clocks = <&scmi_clk SCMI_CLK_CPUB01>;
-			assigned-clock-rates = <816000000>;
 			cpu-idle-states = <&CPU_SLEEP>;
 			i-cache-size = <65536>;
 			i-cache-line-size = <64>;
@@ -214,8 +210,6 @@
 			enable-method = "psci";
 			capacity-dmips-mhz = <1024>;
 			clocks = <&scmi_clk SCMI_CLK_CPUB23>;
-			assigned-clocks = <&scmi_clk SCMI_CLK_CPUB23>;
-			assigned-clock-rates = <816000000>;
 			cpu-idle-states = <&CPU_SLEEP>;
 			i-cache-size = <65536>;
 			i-cache-line-size = <64>;