Added note about AOSP support in China

Author: lenewsad

memdocs/intune/fundamentals/china.md

@@ -55,6 +55,7 @@ Because the China services are operated by a partner from inside China, there ar
 - To follow local regulations and provide improved functionality, the Intune client experience (Company Portal app) may differ in China.
 - Fencing isn't available.
 - Mobile Application Management (MAM) availability is conditional on those apps being available in People's Republic of China.
+- Intune operated by 21Vianet doesn't support Android(AOSP) management for corporate devices.  
 
 ## You control customer data