PhoneWindowManager: Hardware key handling fixes and cleanup

-   Call cancelPreloadRecentApps for long presses and double taps of the home
    key at the right time based on the assigned actions.
    (Reverted Ibd16ff07b9910605c95180b54040f3e2b78939cb as the issue is fixed)
-   Do not allow any menu key events through to apps if
    mPressOnMenuBehavior is not KEY_ACTION_MENU.
-   Don't cancelPreloadRecentApps when menu key is released after a long press.
    (Reverted Idf1d27aa725547e0ddc44905e27da6c1b4540fab as the issue is fixed)
-   For the menu, app switch and assist keys don't cancelPreloadRecentApps on
    long press if the long press has no action assigned to it.

Patch Set 2: -  Fixed not cancelling preload on long press of home when double
                tap is bound to recent apps.
             -  Reduced delta against AOSP.
Patch Set 3: -  Do not perform long press action when key continues to be held
                down after a double tap on home.

Change-Id: I3cc8f9528e5dbd3e0b78308b03440abd9d9351f6