defconfig: lito: Enable diag driver and dependencies

Enable diag driver which provides diagnostic
communication to peripherals and user space clients.
Also enables dependent configs POWER_RESET_QCOM and
QCOM_DLOAD_MODE.

Change-Id: Iaa77d5652edf2d3fdc5eb76443ab5fd626b81f24
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>