MAINTAINERS: update nds32 git repo path

We use git.kernel.org to put nds32's latest code instead of github.

Signed-off-by: Greentime Hu <greentime@andestech.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2c2fce7..967ac42 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -963,7 +963,7 @@
 ANDES ARCHITECTURE
 M:	Greentime Hu <green.hu@gmail.com>
 M:	Vincent Chen <deanbo422@gmail.com>
-T:	git https://github.com/andestech/linux.git
+T:	git https://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux.git
 S:	Supported
 F:	arch/nds32/
 F:	Documentation/devicetree/bindings/interrupt-controller/andestech,ativic32.txt