kbuild: generate autoksyms.h early

When doing a cold build, autoksyms.h starts empty, and is updated late
in the build process to have visibility over the symbols used by in-tree
drivers. But since the symbol whitelist is known upfront, it can be used
to pre-populate autoksyms.h and maximize the amount of code that can be
compiled to its final state in a single pass, hence reducing build time.

Do this by using gen_autoksyms.sh to initialize autoksyms.h instead of
creating an empty file.

Acked-by: Nicolas Pitre <[email protected]>
Tested-by: Matthias Maennich <[email protected]>
Reviewed-by: Matthias Maennich <[email protected]>
Signed-off-by: Quentin Perret <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

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