Screen state cannot be updated while modem was reset.

When modem was resetting by modem assert, and user turns off the screen
before RIL was reconnected, screen state cannot send to modem. This
could lead to the signal strength keep reporting and high power
consumption. Therefore, screen state needs to be checked again when RIL
is connected.

Change-Id: Ia3ede8670d0a962ca32a775ea79100d550be914f