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>

MAINTAINERS

@@ -963,7 +963,7 @@ F:	drivers/staging/iio/*/ad*
 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