defconfig: arm64: Enable wdog ping to cores in low power mode for kona

The watchdog IPI optimization is to not ping cores
in low power modes at pet time, which is enabled by default.
Disable this optimization in debug image of kona, so that
IPI ping goes to cores in the low power mode too.

Change-Id: Ie93e29ce006bfc411fad9d562e45e7cb1829b0f7
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>