CHROMIUM: config: re-sync kernel config after dma-buf kds separation

CHROMIUM: config: re-sync kernel config after dma-buf kds separation

Now, this is only set for exynos:
CONFIG_DMA_SHARED_BUFFER_USES_KDS=y

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
BUG=chromium:232913
TEST=compile kernel for x86 and arm and verify it still boots

Change-Id: I7f5d9471a7fde4dd01a02ce5f383ab931c47353f
Reviewed-on: https://gerrit.chromium.org/gerrit/48630
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Commit-Queue: Daniel Kurtz <djkurtz@chromium.org>