[make] Add ability to deny modules from being used #391
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Certain projects may want to prevent the usage of certain modules from being used. Here are two examples of when this may occur:
The Project has it's own fdt library and does not want developer's using the version of libfdt included with LK
The project does not want developers using mincrypt.
DENY_MODULES
is a list which developers can set in their own project makefiles which is checked on each module inclusion. If that module is on the deny list, it causes a build failure.