lib: utils/reset: Add a sunxi watchdog reset driver One of the watchdogs in the D1 SoC provides a "soft reset" function, which allows software to immediately reset the entire SoC. Add a driver so it can implement the SBI system reset function. Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Anup Patel <anup.patel@wdc.com>