kbuild: Provide a version of merge_into_defconfig without override warnings

While warning on overridden Kconfig options is a good default for merging
config fragements sometimes that is our explicit intent and the warnings
are unhelpful, add a new merge_into_defconfig_override which does the merge
but with warnings suppressed.

Since merge_into_defconfig accepts any number of fragments it is difficult
to allow it to accept the flag.

Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

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