kbuild: set y instead of 1 to KBUILD_{BUILTIN,MODULES}

KBUILD_BUILTIN is set to 1 unless you are building only modules.

KBUILD_MODULES is set to 1 when you are building only modules
(a typical use case is "make modules").

It is more useful to set them to 'y' instead, so we can do
something like:

    always-$(KBUILD_BUILTIN) += vmlinux.lds

This works equivalently to:

    extra-y                  += vmlinux.lds

This allows us to deprecate extra-y. extra-y and always-y are quite
similar, and we do not need both.

Signed-off-by: Masahiro Yamada <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Nicolas Schier <[email protected]>

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