MAINTAINERS: add entry for T-HEAD RISC-V SoC

Currently, I would like to maintain the T-HEAD RISC-V SoC support.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

MAINTAINERS

@@ -18162,6 +18162,14 @@ F:	drivers/perf/riscv_pmu.c
 F:	drivers/perf/riscv_pmu_legacy.c
 F:	drivers/perf/riscv_pmu_sbi.c
 
+RISC-V THEAD SoC SUPPORT
+M:	Jisheng Zhang <jszhang@kernel.org>
+M:	Guo Ren <guoren@kernel.org>
+M:	Fu Wei <wefu@redhat.com>
+L:	linux-riscv@lists.infradead.org
+S:	Maintained
+F:	arch/riscv/boot/dts/thead/
+
 RNBD BLOCK DRIVERS
 M:	Md. Haris Iqbal <haris.iqbal@ionos.com>
 M:	Jack Wang <jinpu.wang@ionos.com>