kbuild: Introduced extra-y, as replacement for EXTRA_TARGETS

EXTRA_TARGETS has been overloaded with functionality.
This is now split in two:
targets := list targets kbuild did not know of otherwise
extra-y := list targets to be build when not building modules only.
extra-y is mainly used to list .o files that is not to be included
in the fnal built-in.o file for a directory.

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