[Base] Notification services shortcut on expanded status bar

- Add a direct access to notifications services with an icon on expanded status bar
- Attempt to fix hover tutorial in first start
- Resize a bit all icons width on expanded status bar fit better notification reminder empty clickable space

coded, based on this commit: https://github.com/CyanogenMod/android_frameworks_base/commit/1bc87e720b68d97aabc214632f908495acfed932 by @cristianomatos

Change-Id: Ie5fb63029374646c364730da22eb7d13e1e367af