doc: board: starfive: Add more info about supported driver

Since PLDA PCIE driver is added and VL805 support is enabled in
defconfig for Starfive Visionfive 2, modify the document to keep
consistent.

Signed-off-by: Shengyu Qu <wiagn233@outlook.com>
Tested-by: Milan P. Stanić <mps@arvanta.net>
1 file changed