Update the doc to explicitly support Meson-AXG
Signed-off-by: NJian Hu <jian.hu@amlogic.com>
Signed-off-by: NYixun Lan <yixun.lan@amlogic.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>