Remove HAVE_SELINUX guards

Android 4.3, and by extension CM 10.2, default to having SELinux on

Change-Id: I0f83c0b9712388216b89dfbe6184ad0a220a74d6
Align the status bar date to the bottom

As in AOSP. Also occupy the whole height area so that the date can be
easily clicked.

Change-Id: I66e5b7a754f27571f987657cc7ccd2ef3bef3f9e
Improve notification shade collapse code.

- Collapse after dismissing the last notification
- Avoid duplicate code paths for collapsing
- Improve variable naming according to AOSP review suggestions

Change-Id: Ic6f26a61f263c5beebbcc9725fe8914d3858576f
Merge branch 'cm-10.2' of git://github.com/PAC-man/android_frameworks_base into PAC4.3