MAINTAINERS: split hisilicon maintenance and add Yongbang Shi for hibmc-drm matainers

To improve maintainability, split the maintainer information for the hibmc and
kirin drivers under the drivers/gpu/drm/hisilicon directory.

drivers/gpu/drm/hisilicon/hibmc driver has almost completed feature development
based on the new generation HiSilicon BMC chip. It was co-developed by
Yongbang Shi, Baihan Li and Lin He. Going forward, this module will be
maintained by Yongbang Shi.

Signed-off-by: Yongbang Shi <shiyongbang@huawei.com>
Acked-by: Tao Tian <tiantao6@hisilicon.com>
Acked-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260319131132.722033-1-shiyongbang@huawei.com

Author: Yongbang Shi

MAINTAINERS

@@ -8607,18 +8607,25 @@ S:	Maintained
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
 F:	drivers/gpu/drm/gma500/
 
-DRM DRIVERS FOR HISILICON
-M:	Xinliang Liu <xinliang.liu@linaro.org>
+DRM DRIVERS FOR HISILICON HIBMC
+M:	Yongbang Shi <shiyongbang@huawei.com>
 M:	Tian Tao  <tiantao6@hisilicon.com>
 R:	Xinwei Kong <kong.kongxinwei@hisilicon.com>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
+F:	drivers/gpu/drm/hisilicon/hibmc
+
+DRM DRIVERS FOR HISILICON KIRIN
+M:	Xinliang Liu <xinliang.liu@linaro.org>
 R:	Sumit Semwal <sumit.semwal@linaro.org>
 R:	Yongqin Liu <yongqin.liu@linaro.org>
 R:	John Stultz <jstultz@google.com>
 L:	dri-devel@lists.freedesktop.org
 S:	Maintained
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
 F:	Documentation/devicetree/bindings/display/hisilicon/
-F:	drivers/gpu/drm/hisilicon/
+F:	drivers/gpu/drm/hisilicon/kirin
 
 DRM DRIVERS FOR LIMA
 M:	Qiang Yu <yuq825@gmail.com>