dt-bindings: update sifive plic compatible string

Add the compatible string "canaan,k210-plic" to the Sifive plic bindings
to indicate the use of the "sifive,plic-1.0.0" IP block in the Canaan
Kendryte K210 SoC. The description is also updated to reflect this
change, that is, that SoCs from other vendors may also use this plic
implementation.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml

@@ -8,10 +8,11 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: SiFive Platform-Level Interrupt Controller (PLIC)
 
 description:
-  SiFive SOCs include an implementation of the Platform-Level Interrupt Controller
-  (PLIC) high-level specification in the RISC-V Privileged Architecture
-  specification. The PLIC connects all external interrupts in the system to all
-  hart contexts in the system, via the external interrupt source in each hart.
+  SiFive SoCs and other RISC-V SoCs include an implementation of the
+  Platform-Level Interrupt Controller (PLIC) high-level specification in
+  the RISC-V Privileged Architecture specification. The PLIC connects all
+  external interrupts in the system to all hart contexts in the system, via
+  the external interrupt source in each hart.
 
   A hart context is a privilege mode in a hardware execution thread. For example,
   in an 4 core system with 2-way SMT, you have 8 harts and probably at least two
@@ -42,7 +43,9 @@ maintainers:
 properties:
   compatible:
     items:
-      - const: sifive,fu540-c000-plic
+      - enum:
+          - sifive,fu540-c000-plic
+          - canaan,k210-plic
       - const: sifive,plic-1.0.0
 
   reg: