Complete event registration in CallManager.

1. Originally CallManager registers for all phone events provided by registerFor interface,

which will cause error msg such as "registerForXXX() in PhoneBase should not be called, CDMAPhone inactive."

for CDMA only events. Register for those events only if phone is CDMA phone.

2. Add registerForPostDialCharacter().

Note, we can't use notifyRegistrants() in handler since we need send

the character that is being processed in msg.arg1.

Change-Id: I48037c8a8e225bb82e203836a041f81f2445f4d8