am 146ef723: When phone is ringing, power button should hang up phone in addition to turning off the screen.

Merge commit '146ef723bc0fc87aba00400196a5e64ab128ee17' into eclair-mr2

* commit '146ef723bc0fc87aba00400196a5e64ab128ee17':
  When phone is ringing, power button should hang up phone in addition to turning off the screen.