MAINTAINERS: update openEuler/MAINTAINERS for LoongArch

LoongArch inclusion
category: doc
bugzilla: https://gitee.com/openeuler/kernel/issues/I7EKLJ

--------------------------------

Add LoongArch maintainers to openEuler/MAINTAINERS.
Signed-off-by: Nlixuefeng <lixuefeng@loongson.cn>

openEuler/MAINTAINERS

@@ -154,6 +154,32 @@ F:	drivers/i2c/busses/i2c-hisi.c
 F:	drivers/spi/spi-hisi-*
 F:	drivers/gpio/gpio-hisi.c
 
+LoongArch ARCHITECTURE
+M:	Xuefeng Li <lixuefeng@loongson.cn>
+M:	Bibo Mao <maobibo@loongson.cn>
+M:	Hongchen Zhang <zhanghongchen@loongson.cn>
+S:	Maintained
+F:	arch/loongarch/
+F:	tools/arch/loongarch/
+F:	drivers/gpu/drm/loongson/
+F:	tools/perf/arch/loongarch/
+F:	drivers/irqchip/irq-loongson-*
+F:	drivers/irqchip/irq-loongarch-*
+F:	drivers/spi/spi-loongson.c
+F:	drivers/char/ipmi/btlock.h
+F:	drivers/char/ipmi/ipmi_si.h
+F:	drivers/char/ipmi/ipmi_si_intf.c
+F:	drivers/char/ipmi/ipmi_si_ls2k500.c
+F:	drivers/char/ipmi/kcs_bmc_ls2k500.h
+F:	drivers/gpio/gpio-loongson.c
+F:	drivers/i2c/busses/i2c-loongson.c
+F:	drivers/pci/controller/pci-loongson.c
+F:	drivers/input/serio/i8042-loongsonio.h
+F:	drivers/cpufreq/loongson3-acpi-cpufreq.c
+F:	drivers/firmware/efi/libstub/loongarch-stub.c
+F:	drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+F:	drivers/platform/loongarch/loongson_generic_laptop.c
+
 PGO KERNEL
 M:	Yancheng Li <liyancheng@huawei.com>
 M:	Zhiheng Xie <xiezhiheng@huawei.com>