defconfig: Enable DM_SNAPSHOT for Kona target

Enable CONFIG_DM_SNAPSHOT for supporting virtual A/B feature on Kona
target.

Change-Id: I8c9c3eb44e346feee5d0953f8e059392f804089a
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>
2 files changed