Enabling MODPROBE_SMALL causes busybox to supply a version of the kernel
module handling utilities (modprobe, etc.) that rely on a special module
dependency index (modules.dep.bb) instead of the traditional indexes
(modules.dep, etc.) used and generated by module-init-tools. Buildroot
only supports the traditional indexes.
When modules.dep.bb is missing, busybox will attempt to load a module
before checking for dependencies, resulting in a flood of "unknown
symbol" errors in dmesg when dependencies are missing. Things actually
still work (as busybox tries again after resolving dependencies), but
the messages are ugly.
Avoid the whole mess by disabling MODPROBE_SMALL, which is what
buildroot expects anyway.
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