power:qpnp-charger:when charger out,wait for a moment to enable soc change

when usb charger in ,do not allow capacity decrease. This may cause unplugin charger, the soc will decrease immediately,
such as from 100% to 99%. So when charger out, wait for a moment to enable soc change. This includes the time spent in suspend.

BUG:22880388

Change-Id: I27ec309ae025ed5e5b5a81c6e6289b8899724037
Signed-off-by: libing <l00228880@notesmail.huawei.com>