[KernelCache] Remove 'Load Selected Image and Dependencies'

Fixes https://github.com/Vector35/binaryninja-api/issues/7615.

The dependency loading for kernel cache images was copied from the
shared cache code, and looks for `LC_LOAD_DYLIB` load commands to
determine the direct dependencies of an image. Images in kernel caches
don't use `LC_LOAD_DYLIB` load commands so no dependencies were ever
loaded. It could, however, result in a crash.