MAINTAINERS: add Ryan-CW as owner of serial_v2

Author: Ryan-CW-Code

MAINTAINERS

@@ -68,3 +68,8 @@ owners: Bingru Zhang(Rbb666)<751061401@qq.com>, Yuqiang Wang(kurisaW)<2053731441
 tag: workflow
 path: .github
 owners: supper thomas(supperthomas)<78900636@qq.com>, Bingru Zhang(Rbb666)<751061401@qq.com>, Yuqiang Wang(kurisaW)<2053731441@qq.com>
+
+tag: serial_v2
+path: components/drivers/serial/dev_serial_v2.c
+path: components/drivers/include/drivers/dev_serial_v2.h
+owners: Chen Bei Dou(Ryan-CW-Code)<1831931681@qq.com>