amend miui hook for PhoneNumberUtils

Change-Id: I7877f3336d38603259696a47255504d95dfecd11
Change shutdown and restart dialog's title, message and positive button text.

MIUI-9426

Change-Id: I504e6af3b3eebb96f13bf8b6a02f6d1c2ef91855
Ref-Id: I274fe9fdf1dad0881121b1e3ede6181c860f28ed