kernel: enable THIN_ARCHIVES by default

kernel: enable THIN_ARCHIVES by default

THIN_ARCHIVES option is enabled by default in the kernel configuration
and no one target config disables it. So enable it by default and remove
this symbol from target specific configs to keep them light.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
(cherry picked from commit 67a3cdcbb05559549985a189eabaf2df92559ed7)