rockchip: rock960-rk3399: fix mail format in MAINTAINER file

The mail format should have '<>', or else the patman won't
recognize it correctley.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/vamrs/rock960_rk3399/MAINTAINERS b/board/vamrs/rock960_rk3399/MAINTAINERS
index 22b2db9..5ee5256 100644
--- a/board/vamrs/rock960_rk3399/MAINTAINERS
+++ b/board/vamrs/rock960_rk3399/MAINTAINERS
@@ -1,11 +1,11 @@
 ROCK960-RK3399
-M:      Manivannan Sadhasivam manivannan.sadhasivam@linaro.org
+M:      Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 S:      Maintained
 F:      board/rockchip/rock960_rk3399
 F:      include/configs/rock960_rk3399.h
 F:      configs/rock960-rk3399_defconfig
 
 FICUS EE
-M:      Manivannan Sadhasivam manivannan.sadhasivam@linaro.org
+M:      Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 S:      Maintained
 F:	configs/ficus-rk3399_defconfig