xilinx: zynqmp: Enable the vidconsole by default

Add the vidconsole flags for video serial console.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/f1b58d1d1052bf2d8cb8b25af44ecbb567ebbd4a.1684312924.git.michal.simek@amd.com