arm64: versal-net: Add support for mini configuration

Versal NET mini configuration is designed for running memory test. Current
output is on DCC but changing serial0 alias to pl011 will move console to
serial port.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/aec3f41a4cc48c45b8f07dd6e423d5838dbcc9d7.1663589964.git.michal.simek@amd.com