docs: boards: amlogic: add documentation for BananaPi M2-Pro

Add build docs for the BPI-M2-PRO board.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230323143142.780306-6-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/board/amlogic/u200/MAINTAINERS b/board/amlogic/u200/MAINTAINERS
index 919e349..f429c21 100644
--- a/board/amlogic/u200/MAINTAINERS
+++ b/board/amlogic/u200/MAINTAINERS
@@ -4,8 +4,10 @@
 L:	u-boot-amlogic@groups.io
 F:	board/amlogic/u200/
 F:	configs/u200_defconfig
+F:	configs/bananapi-m2pro_defconfig
 F:	configs/bananapi-m5_defconfig
 F:	configs/radxa-zero_defconfig
 F:	doc/board/amlogic/u200.rst
+F:	doc/board/amlogic/bananapi-m2pro.rst
 F:	doc/board/amlogic/bananapi-m5.rst
 F:	doc/board/amlogic/radxa-zero.rst