ARM: amlogic: add Banana Pi M5

Banana Pi BPI-M5 is a credit card format SBC with the following features:
- Amlogic S905X3 quad core Cortex-A55
- Mali-G31 GPU
- 4GB LPDDR4
- 16GB eMMC flash
- 4 USB 3.0
- 1 GbE ethernet
- HDMI output
- 2x LEDS
- SDCard
- 2.5mm Jack with Stereo Audio + CVBS
- Infrared Received
- ADC Button
- GPIO Button
- 40 pins header + 3pins debug header

[narmstrong: add missing CONFIG_SYS_LOAD_ADDR from defconfig]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/doc/board/amlogic/index.rst b/doc/board/amlogic/index.rst
index de1a9ce..2913ab2 100644
--- a/doc/board/amlogic/index.rst
+++ b/doc/board/amlogic/index.rst
@@ -19,6 +19,7 @@
 |        			| Nanopi-K2 | Khadas-VIM      | Libretech-PC |	          | SEI510     | Khadas-VIM3 | Khadas-VIM3L |
 |        			| P200	    | LibreTech-CC v1 |	WeTek Core2  |	          |            | GT-King/Pro | Odroid-C4    |
 |        			| P201	    | LibreTech-AC v2 |	             |	          |            | GSKing-X    | Odroid-HC4   |
+|                               |           |                 |              |            |            |             | BananaPi-M5  |
 +-------------------------------+-----------+-----------------+--------------+------------+------------+-------------+--------------+
 | UART                       	| **Yes**   | **Yes**         | **Yes**      | **Yes**    | **Yes**    | **Yes**     | **Yes**      |
 +-------------------------------+-----------+-----------------+--------------+------------+------------+-------------+--------------+