board: rockchip: rk3399: Add device tree files to MAINTAINERS

Update MAINTAINERS files for RK3399 boards to include related device
tree files. Also correct a few filenames.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/pine64/rockpro64_rk3399/MAINTAINERS b/board/pine64/rockpro64_rk3399/MAINTAINERS
index 220ee21..d9e11f4 100644
--- a/board/pine64/rockpro64_rk3399/MAINTAINERS
+++ b/board/pine64/rockpro64_rk3399/MAINTAINERS
@@ -3,5 +3,5 @@
 S:	Maintained
 F:	board/pine64/rockpro64_rk3399
 F:	include/configs/rockpro64_rk3399.h
-F:	arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
+F:	arch/arm/dts/rk3399-rockpro64*
 F:	configs/rockpro64-rk3399_defconfig