dts: arm: st: stm32h7rs: remove flash controller clock property

Bit 8 of AHB3 is reserved, there is no clock-enable bit for the flash
controller according to the Reference Manual.

Signed-off-by: Arthur Gay <[email protected]>

Author: arthur-mmlw

dts/arm/st/h7rs/stm32h7rs.dtsi

@@ -180,7 +180,6 @@
 			compatible = "st,stm32-flash-controller", "st,stm32h7-flash-controller";
 			reg = <0x52002000 0x400>;
 			interrupts = <8 0>;
-			clocks = <&rcc STM32_CLOCK(AHB3, 8)>;
 
 			#address-cells = <1>;
 			#size-cells = <1>;