Kbuild late updates for v4.21

- improve boolinit.cocci and use_after_iter.cocci semantic patches

- fix alignment for kallsyms

- move 'asm goto' compiler test to Kconfig and clean up jump_label
  CONFIG option

- generate asm-generic wrappers automatically if arch does not implement
  mandatory UAPI headers

- remove redundant generic-y defines

- misc cleanups
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