xilinx: zynq: Disable LMB for mini configurations

There shouldn't be a reason to have LMB on for these configurations.
LMB was already disabled for ZynqMP by commit 0063487a5b60 ("configs:
zynqmp: Disable LMB for mini u-boot").

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/07d95f619a15672d1a234eddcfbb54c0ab382eaa.1662460867.git.michal.simek@amd.com