charger: reduce timeout for power-on with power key to 2 secs

#define NSEC_PER_MSEC           (1000000LL)

#define SCREEN_ON_TIME          (5 * MSEC_PER_SEC)

#define POWER_ON_KEY_TIME       (5 * MSEC_PER_SEC)

#define POWER_ON_KEY_TIME       (2 * MSEC_PER_SEC)

#define UNPLUGGED_SHUTDOWN_TIME (10 * MSEC_PER_SEC)

#define LOGE(x...) do { KLOG_ERROR("charger", x); } while (0)