x86/defconfigs: Refresh defconfig files

Perform a 'make savedefconfig' pass over our main defconfig files,
which keeps the defconfig result the same, but compresses
the file where defaults were changed, options removed or
reordered.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200724130638.645844-2-mingo@kernel.org