arm64: zynqmp: Remove mkimage fit script

Platform has been switched to binman that's why there is no need for this
script and also Kconfig symbols.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/cf438091e43c4c9d535a9cfa2886673aa42a4370.1730452668.git.michal.simek@amd.com
2 files changed