MIPS: Loongson64: loongson3_defconfig: Enable amdgpu drm driver

As it's usuable on LS3A4000 platform. Tested with RX550, glmark2
got about 4235 score.
Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/configs/loongson3_defconfig

@@ -276,6 +276,13 @@ CONFIG_MEDIA_SUPPORT=m
 CONFIG_MEDIA_USB_SUPPORT=y
 CONFIG_USB_VIDEO_CLASS=m
 CONFIG_DRM=y
+CONFIG_DRM_AMDGPU=m
+CONFIG_DRM_AMDGPU_SI=y
+CONFIG_DRM_AMDGPU_CIK=y
+CONFIG_DRM_AMDGPU_USERPTR=y
+CONFIG_DRM_AMD_ACP=y
+CONFIG_DRM_AMD_DC=y
+CONFIG_DRM_AMD_DC_SI=y
 CONFIG_DRM_RADEON=m
 CONFIG_DRM_QXL=y
 CONFIG_DRM_VIRTIO_GPU=y