arm64: versal: Add octal spi flash mini u-boot configuration

Add configuration file for mini u-boot configuration which runs on a
smaller footprint from on chip memory(OCM). This configuration has
required CONFIG's enabled to support octal spi flash and uses DCC terminal
for console output. Add required dts for octal spi flash mini u-boot
configuration.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/20221116141155.14788-4-ashok.reddy.soma@amd.com


Signed-off-by: Michal Simek <michal.simek@amd.com>