dt-bindings: devfreq: event: rockchip,dfi: Add rk3588 support

This adds rockchip,rk3588-dfi to the list of compatibles. Unlike ealier
SoCs the rk3588 has four interrupts (one for each channel) instead of
only one, so increase the number of allowed interrupts to four.

Link: https://lore.kernel.org/all/[e-mail]/
Acked-by: Conor Dooley <[e-mail]>
Acked-by: Chanwoo Choi <[e-mail]>
Signed-off-by: Sascha Hauer <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

Documentation/devicetree/bindings/devfreq/event/rockchip,dfi.yaml

···
     enum:
       - rockchip,rk3399-dfi
       - rockchip,rk3568-dfi
+      - rockchip,rk3588-dfi
 
   clocks:
     maxItems: 1
···
       - const: pclk_ddr_mon
 
   interrupts:
-    maxItems: 1
+    minItems: 1
+    maxItems: 4
 
   reg:
     maxItems: 1