arm64: zynqmp: Align mini-qspi DT with dt-schema

fixed-clock can't be described on the bus because it is missing reg
property. Also remove additional compatible string for flash. Mini qspi
configuration is used with multiple different flashes that's why describing
only one is not correct but also not required based on DT schema.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/0e4721eda8d0f23a9d9f0c15cf887f0bba639cd4.1726219714.git.michal.simek@amd.com
1 file changed