sunxi: probe both screen layers at disp probing

sunxi: probe both screen layers at disp probing

Some boards use an inverted screen layer configuration, making the
original code unable to enable disp layers functionality properly.

This commit adds a fallback mechanism to the actual disp probing
sequence, allowing those cases to be properly handled.

Signed-off-by: Jérôme Oufella 
  • [DH] src/sunxi_disp.c