riscv: dts: renesas: Add Andes PMU extension for r9a07g043f

xandespmu stands for Andes Performance Monitor Unit extension.
Based on the added Andes PMU ISA string, the SBI PMU driver
will make use of the non-standard irq source.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240222083946.3977135-10-peterlin@andestech.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/boot/dts/renesas/r9a07g043f.dtsi

@@ -27,7 +27,7 @@ cpu0: cpu@0 {
 			riscv,isa-base = "rv64i";
 			riscv,isa-extensions = "i", "m", "a", "f", "d", "c",
 					       "zicntr", "zicsr", "zifencei",
-					       "zihpm";
+					       "zihpm", "xandespmu";
 			mmu-type = "riscv,sv39";
 			i-cache-size = <0x8000>;
 			i-cache-line-size = <0x40>;